diff --git a/dll/directx/wine/d3dcompiler_43/main.c b/dll/directx/wine/d3dcompiler_43/main.c
index 3404655ac8e..685bbe6e4bd 100644
--- a/dll/directx/wine/d3dcompiler_43/main.c
+++ b/dll/directx/wine/d3dcompiler_43/main.c
@@ -30,8 +30,10 @@ BOOL WINAPI DllMain(HINSTANCE inst, DWORD reason, void *reserved)
 {
     switch (reason)
     {
+#ifndef __REACTOS__
         case DLL_WINE_PREATTACH:
             return FALSE; /* prefer native version */
+#endif
         case DLL_PROCESS_ATTACH:
             DisableThreadLibraryCalls(inst);
             break;
diff --git a/dll/directx/wine/d3drm/d3drm_main.c b/dll/directx/wine/d3drm/d3drm_main.c
index 075b331e051..09d4d42dc66 100644
--- a/dll/directx/wine/d3drm/d3drm_main.c
+++ b/dll/directx/wine/d3drm/d3drm_main.c
@@ -27,8 +27,10 @@ BOOL WINAPI DllMain(HINSTANCE inst, DWORD reason, void *reserved)
 {
     switch(reason)
     {
+#ifndef __REACTOS__
     case DLL_WINE_PREATTACH:
         return FALSE;  /* prefer native version */
+#endif
     case DLL_PROCESS_ATTACH:
         DisableThreadLibraryCalls( inst );
         break;
diff --git a/dll/directx/wine/d3dx9_36/main.c b/dll/directx/wine/d3dx9_36/main.c
index e0fc2d50332..4c0e78b2a57 100644
--- a/dll/directx/wine/d3dx9_36/main.c
+++ b/dll/directx/wine/d3dx9_36/main.c
@@ -34,8 +34,10 @@ BOOL WINAPI DllMain(HINSTANCE inst, DWORD reason, void *reserved)
 {
     switch(reason)
     {
+#ifndef __REACTOS__
     case DLL_WINE_PREATTACH:
         return FALSE; /* prefer native version */
+#endif
     case DLL_PROCESS_ATTACH:
         DisableThreadLibraryCalls(inst);
         break;
diff --git a/dll/win32/activeds/activeds_main.c b/dll/win32/activeds/activeds_main.c
index 69c5c447dcc..5407ea9dc6e 100644
--- a/dll/win32/activeds/activeds_main.c
+++ b/dll/win32/activeds/activeds_main.c
@@ -46,8 +46,10 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 
     switch(fdwReason)
     {
+#ifndef __REACTOS__
     case DLL_WINE_PREATTACH:
         return FALSE;  /* prefer native version */
+#endif
     case DLL_PROCESS_ATTACH:
         DisableThreadLibraryCalls( hinstDLL );
         break;
diff --git a/dll/win32/clusapi/clusapi.c b/dll/win32/clusapi/clusapi.c
index 88c6fbfc12b..e9de50ecc90 100644
--- a/dll/win32/clusapi/clusapi.c
+++ b/dll/win32/clusapi/clusapi.c
@@ -124,8 +124,10 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 {
     switch(fdwReason)
     {
+#ifndef __REACTOS__
     case DLL_WINE_PREATTACH:
         return FALSE;  /* prefer native version */
+#endif
     case DLL_PROCESS_ATTACH:
         DisableThreadLibraryCalls( hinstDLL );
         break;
diff --git a/dll/win32/compstui/compstui_main.c b/dll/win32/compstui/compstui_main.c
index e05acdc0fad..934ba076593 100644
--- a/dll/win32/compstui/compstui_main.c
+++ b/dll/win32/compstui/compstui_main.c
@@ -40,8 +40,10 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 
     switch(fdwReason)
     {
+#ifndef __REACTOS__
         case DLL_WINE_PREATTACH:
             return FALSE;  /* prefer native version */
+#endif
 
         case DLL_PROCESS_ATTACH:
             DisableThreadLibraryCalls( hinstDLL );
diff --git a/dll/win32/credui/credui_main.c b/dll/win32/credui/credui_main.c
index 56789bc57d6..5684309bdb2 100644
--- a/dll/win32/credui/credui_main.c
+++ b/dll/win32/credui/credui_main.c
@@ -74,8 +74,10 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 
     switch (fdwReason)
     {
+#ifndef __REACTOS__
     case DLL_WINE_PREATTACH:
         return FALSE;	/* prefer native version */
+#endif
 
     case DLL_PROCESS_ATTACH:
         DisableThreadLibraryCalls(hinstDLL);
diff --git a/dll/win32/cryptdlg/main.c b/dll/win32/cryptdlg/main.c
index 5a3e6bf418f..79cb64b5759 100644
--- a/dll/win32/cryptdlg/main.c
+++ b/dll/win32/cryptdlg/main.c
@@ -46,8 +46,10 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 
     switch (fdwReason)
     {
+#ifndef __REACTOS__
         case DLL_WINE_PREATTACH:
             return FALSE;    /* prefer native version */
+#endif
         case DLL_PROCESS_ATTACH:
             DisableThreadLibraryCalls(hinstDLL);
             hInstance = hinstDLL;
diff --git a/dll/win32/cryptdll/cryptdll.c b/dll/win32/cryptdll/cryptdll.c
index 963a2684e08..3f1e438d02c 100644
--- a/dll/win32/cryptdll/cryptdll.c
+++ b/dll/win32/cryptdll/cryptdll.c
@@ -29,8 +29,10 @@ BOOL WINAPI DllMain (HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
     TRACE("%p,%x,%p\n", hinstDLL, fdwReason, lpvReserved);
 
     switch (fdwReason) {
+#ifndef __REACTOS__
         case DLL_WINE_PREATTACH:
             return FALSE;  /* prefer native version */
+#endif
         case DLL_PROCESS_ATTACH:
             DisableThreadLibraryCalls(hinstDLL);
             break;
diff --git a/dll/win32/cryptui/main.c b/dll/win32/cryptui/main.c
index 75f55df1c17..c39ab5ed82a 100644
--- a/dll/win32/cryptui/main.c
+++ b/dll/win32/cryptui/main.c
@@ -52,8 +52,10 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 
     switch (fdwReason)
     {
+#ifndef __REACTOS__
         case DLL_WINE_PREATTACH:
             return FALSE;    /* prefer native version */
+#endif
         case DLL_PROCESS_ATTACH:
             hInstance = hinstDLL;
             DisableThreadLibraryCalls(hinstDLL);
diff --git a/dll/win32/faultrep/faultrep.c b/dll/win32/faultrep/faultrep.c
index 3191659cd6c..7c5f2157750 100644
--- a/dll/win32/faultrep/faultrep.c
+++ b/dll/win32/faultrep/faultrep.c
@@ -117,8 +117,10 @@ BOOL WINAPI DllMain(HINSTANCE inst, DWORD reason, LPVOID reserved)
 {
     switch(reason)
     {
+#ifndef __REACTOS__
     case DLL_WINE_PREATTACH:
         return FALSE;
+#endif
     case DLL_PROCESS_ATTACH:
         DisableThreadLibraryCalls(inst);
         break;
diff --git a/dll/win32/fontsub/main.c b/dll/win32/fontsub/main.c
index a0a6032d051..e8eb06b195a 100644
--- a/dll/win32/fontsub/main.c
+++ b/dll/win32/fontsub/main.c
@@ -30,8 +30,10 @@ BOOL WINAPI DllMain (HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
     TRACE("%p,%x,%p\n", hinstDLL, fdwReason, lpvReserved);
 
     switch (fdwReason) {
+#ifndef __REACTOS__
         case DLL_WINE_PREATTACH:
             return FALSE;  /* prefer native version */
+#endif
         case DLL_PROCESS_ATTACH:
             DisableThreadLibraryCalls(hinstDLL);
             break;
diff --git a/dll/win32/hnetcfg/hnetcfg.c b/dll/win32/hnetcfg/hnetcfg.c
index 5cc24a1447b..9d90fa4301e 100644
--- a/dll/win32/hnetcfg/hnetcfg.c
+++ b/dll/win32/hnetcfg/hnetcfg.c
@@ -123,8 +123,10 @@ BOOL WINAPI DllMain(HINSTANCE hInstDLL, DWORD fdwReason, LPVOID reserved)
     TRACE("(0x%p, %d, %p)\n", hInstDLL, fdwReason, reserved);
 
     switch(fdwReason) {
+#ifndef __REACTOS__
         case DLL_WINE_PREATTACH:
             return FALSE;
+#endif
         case DLL_PROCESS_ATTACH:
             instance = hInstDLL;
             DisableThreadLibraryCalls(hInstDLL);
diff --git a/dll/win32/inetcomm/inetcomm_main.c b/dll/win32/inetcomm/inetcomm_main.c
index 75436286631..c916ea18d74 100644
--- a/dll/win32/inetcomm/inetcomm_main.c
+++ b/dll/win32/inetcomm/inetcomm_main.c
@@ -48,8 +48,10 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 
     switch (fdwReason)
     {
+#ifndef __REACTOS__
     case DLL_WINE_PREATTACH:
         return FALSE;
+#endif
     case DLL_PROCESS_ATTACH:
         DisableThreadLibraryCalls(hinstDLL);
         instance = hinstDLL;
diff --git a/dll/win32/initpki/main.c b/dll/win32/initpki/main.c
index b7260f37ee0..0583f7152e9 100644
--- a/dll/win32/initpki/main.c
+++ b/dll/win32/initpki/main.c
@@ -31,8 +31,10 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 
     switch (fdwReason)
     {
+#ifndef __REACTOS__
         case DLL_WINE_PREATTACH:
             return FALSE;    /* prefer native version */
+#endif
         case DLL_PROCESS_ATTACH:
             DisableThreadLibraryCalls(hinstDLL);
             break;
diff --git a/dll/win32/inseng/inseng_main.c b/dll/win32/inseng/inseng_main.c
index 213b27ee7b8..958724275d7 100644
--- a/dll/win32/inseng/inseng_main.c
+++ b/dll/win32/inseng/inseng_main.c
@@ -1275,8 +1275,10 @@ BOOL WINAPI DllMain(HINSTANCE hInstDLL, DWORD fdwReason, LPVOID lpv)
 {
     switch(fdwReason)
     {
+#ifndef __REACTOS__
     case DLL_WINE_PREATTACH:
         return FALSE;  /* prefer native version */
+#endif
     case DLL_PROCESS_ATTACH:
         instance = hInstDLL;
         DisableThreadLibraryCalls(hInstDLL);
diff --git a/dll/win32/itircl/itircl_main.c b/dll/win32/itircl/itircl_main.c
index e35bbba3359..9b18a7423fc 100644
--- a/dll/win32/itircl/itircl_main.c
+++ b/dll/win32/itircl/itircl_main.c
@@ -33,8 +33,10 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 
     switch (fdwReason)
     {
+#ifndef __REACTOS__
         case DLL_WINE_PREATTACH:
             return FALSE;    /* prefer native version */
+#endif
         case DLL_PROCESS_ATTACH:
             DisableThreadLibraryCalls(hinstDLL);
             break;
diff --git a/dll/win32/loadperf/loadperf_main.c b/dll/win32/loadperf/loadperf_main.c
index 54901a739af..8172ec2dc63 100644
--- a/dll/win32/loadperf/loadperf_main.c
+++ b/dll/win32/loadperf/loadperf_main.c
@@ -37,8 +37,10 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 
     switch(fdwReason)
     {
+#ifndef __REACTOS__
     case DLL_WINE_PREATTACH:
         return FALSE; /* prefer native version */
+#endif
     case DLL_PROCESS_ATTACH:
         DisableThreadLibraryCalls(hinstDLL);
         break;
diff --git a/dll/win32/mgmtapi/mgmtapi.c b/dll/win32/mgmtapi/mgmtapi.c
index 06c540a527e..5fc90fa51dd 100644
--- a/dll/win32/mgmtapi/mgmtapi.c
+++ b/dll/win32/mgmtapi/mgmtapi.c
@@ -29,8 +29,10 @@ BOOL WINAPI DllMain( HINSTANCE hinst, DWORD reason, LPVOID reserved )
 
     switch (reason)
     {
+#ifndef __REACTOS__
         case DLL_WINE_PREATTACH:
             return FALSE;    /* prefer native version */
+#endif
         case DLL_PROCESS_ATTACH:
             DisableThreadLibraryCalls( hinst );
             break;
diff --git a/dll/win32/mprapi/mprapi.c b/dll/win32/mprapi/mprapi.c
index 715f1b8cada..248e9bec540 100644
--- a/dll/win32/mprapi/mprapi.c
+++ b/dll/win32/mprapi/mprapi.c
@@ -34,8 +34,10 @@ BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved)
 
     switch(reason)
     {
+#ifndef __REACTOS__
     case DLL_WINE_PREATTACH:
         return FALSE;  /* prefer native version */
+#endif
 
     case DLL_PROCESS_ATTACH:
         DisableThreadLibraryCalls( hinst );
diff --git a/dll/win32/mscat32/main.c b/dll/win32/mscat32/main.c
index 8408070282c..6009a29a1d3 100644
--- a/dll/win32/mscat32/main.c
+++ b/dll/win32/mscat32/main.c
@@ -29,7 +29,9 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 {
     TRACE("(%p, %d, %p)\n",hinstDLL,fdwReason,lpvReserved);
 
+#ifndef __REACTOS__
     if (fdwReason == DLL_WINE_PREATTACH) return FALSE; /* prefer native version */
+#endif
 
     if (fdwReason == DLL_PROCESS_ATTACH)
     {
diff --git a/dll/win32/mscoree/mscoree_main.c b/dll/win32/mscoree/mscoree_main.c
index 2af851806cf..e3507c4d275 100644
--- a/dll/win32/mscoree/mscoree_main.c
+++ b/dll/win32/mscoree/mscoree_main.c
@@ -197,8 +197,10 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 
     switch (fdwReason)
     {
+#ifndef __REACTOS__
     case DLL_WINE_PREATTACH:
         return FALSE;  /* prefer native version */
+#endif
     case DLL_PROCESS_ATTACH:
         runtimehost_init();
         DisableThreadLibraryCalls(hinstDLL);
diff --git a/dll/win32/msctf/msctf.c b/dll/win32/msctf/msctf.c
index a20d0fd55b6..ff166716ccf 100644
--- a/dll/win32/msctf/msctf.c
+++ b/dll/win32/msctf/msctf.c
@@ -556,8 +556,10 @@ BOOL WINAPI DllMain(HINSTANCE hinst, DWORD fdwReason, LPVOID fImpLoad)
     TRACE("%p 0x%x %p\n", hinst, fdwReason, fImpLoad);
     switch (fdwReason)
     {
+#ifndef __REACTOS__
         case DLL_WINE_PREATTACH:
             return FALSE;   /* prefer native version */
+#endif
         case DLL_PROCESS_ATTACH:
             MSCTF_hinstance = hinst;
             tlsIndex = TlsAlloc();
diff --git a/dll/win32/msftedit/msftedit_main.c b/dll/win32/msftedit/msftedit_main.c
index c578efafda3..112aae45604 100644
--- a/dll/win32/msftedit/msftedit_main.c
+++ b/dll/win32/msftedit/msftedit_main.c
@@ -47,8 +47,10 @@ BOOL WINAPI DllMain(HINSTANCE inst, DWORD reason, LPVOID reserved)
 
     switch(reason)
     {
+#ifndef __REACTOS__
     case DLL_WINE_PREATTACH:
         return FALSE; /* prefer native version */
+#endif
     case DLL_PROCESS_ATTACH:
         /* explicitly load riched20 since it creates the window classes at dll attach time */
         richedit = LoadLibraryW( riched20W );
diff --git a/dll/win32/msimtf/main.c b/dll/win32/msimtf/main.c
index 76ad6548f4b..8410c4884db 100644
--- a/dll/win32/msimtf/main.c
+++ b/dll/win32/msimtf/main.c
@@ -44,8 +44,10 @@ BOOL WINAPI DllMain(HINSTANCE hInstDLL, DWORD fdwReason, LPVOID lpv)
 {
     switch(fdwReason)
     {
+#ifndef __REACTOS__
     case DLL_WINE_PREATTACH:
         return FALSE;  /* prefer native version */
+#endif
     case DLL_PROCESS_ATTACH:
         msimtf_instance = hInstDLL;
         DisableThreadLibraryCalls(hInstDLL);
diff --git a/dll/win32/msisip/main.c b/dll/win32/msisip/main.c
index aabea78ae62..4ef12c2c945 100644
--- a/dll/win32/msisip/main.c
+++ b/dll/win32/msisip/main.c
@@ -34,8 +34,10 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 
     switch (fdwReason)
     {
+#ifndef __REACTOS__
         case DLL_WINE_PREATTACH:
             return FALSE;    /* prefer native version */
+#endif
         case DLL_PROCESS_ATTACH:
             DisableThreadLibraryCalls(hinstDLL);
             break;
diff --git a/dll/win32/msnet32/msnet_main.c b/dll/win32/msnet32/msnet_main.c
index 8303b8f1730..6229fd25e88 100644
--- a/dll/win32/msnet32/msnet_main.c
+++ b/dll/win32/msnet32/msnet_main.c
@@ -35,8 +35,10 @@ BOOL WINAPI DllMain( HINSTANCE inst, DWORD reason, LPVOID reserved )
 {
     switch(reason)
     {
+#ifndef __REACTOS__
     case DLL_WINE_PREATTACH:
         return FALSE;  /* prefer native version */
+#endif
     case DLL_PROCESS_ATTACH:
         DisableThreadLibraryCalls( inst );
         break;
diff --git a/dll/win32/mssign32/mssign32_main.c b/dll/win32/mssign32/mssign32_main.c
index da7551e6d1b..4385d0a2543 100644
--- a/dll/win32/mssign32/mssign32_main.c
+++ b/dll/win32/mssign32/mssign32_main.c
@@ -35,8 +35,10 @@ BOOL WINAPI DllMain( HINSTANCE hinst, DWORD reason, LPVOID lpv )
 {
     switch(reason)
     {
+#ifndef __REACTOS__
     case DLL_WINE_PREATTACH:
         return FALSE;  /* prefer native version */
+#endif
     case DLL_PROCESS_ATTACH:
         DisableThreadLibraryCalls( hinst );
         break;
diff --git a/dll/win32/mssip32/main.c b/dll/win32/mssip32/main.c
index abefdd0b1b2..0306b91389d 100644
--- a/dll/win32/mssip32/main.c
+++ b/dll/win32/mssip32/main.c
@@ -30,8 +30,10 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 
     switch (fdwReason)
     {
+#ifndef __REACTOS__
         case DLL_WINE_PREATTACH:
             return FALSE;    /* prefer native version */
+#endif
         case DLL_PROCESS_ATTACH:
             DisableThreadLibraryCalls(hinstDLL);
             break;
diff --git a/dll/win32/mstask/mstask_main.c b/dll/win32/mstask/mstask_main.c
index aa6693d1e8e..34851f868fc 100644
--- a/dll/win32/mstask/mstask_main.c
+++ b/dll/win32/mstask/mstask_main.c
@@ -36,8 +36,10 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 
     switch (fdwReason)
     {
+#ifndef __REACTOS__
         case DLL_WINE_PREATTACH:
             return FALSE;
+#endif
         case DLL_PROCESS_ATTACH:
             DisableThreadLibraryCalls(hinstDLL);
             hInst = hinstDLL;
diff --git a/dll/win32/npptools/main.c b/dll/win32/npptools/main.c
index ad2b8931556..58cbda687b6 100644
--- a/dll/win32/npptools/main.c
+++ b/dll/win32/npptools/main.c
@@ -26,8 +26,10 @@ BOOL WINAPI DllMain(HINSTANCE instance, DWORD reason, LPVOID reserved)
 {
     switch (reason)
     {
+#ifndef __REACTOS__
         case DLL_WINE_PREATTACH:
             return FALSE;    /* prefer native version */
+#endif
         case DLL_PROCESS_ATTACH:
             DisableThreadLibraryCalls(instance);
             break;
diff --git a/dll/win32/ntdsapi/ntdsapi.c b/dll/win32/ntdsapi/ntdsapi.c
index 8966a679acf..85ba76b469e 100644
--- a/dll/win32/ntdsapi/ntdsapi.c
+++ b/dll/win32/ntdsapi/ntdsapi.c
@@ -36,8 +36,10 @@ BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved)
 
     switch(reason)
     {
+#ifndef __REACTOS__
     case DLL_WINE_PREATTACH:
         return FALSE;  /* prefer native version */
+#endif
 
     case DLL_PROCESS_ATTACH:
         DisableThreadLibraryCalls( hinst );
diff --git a/dll/win32/olethk32/main.c b/dll/win32/olethk32/main.c
index 13de72eb197..e96b364e90f 100644
--- a/dll/win32/olethk32/main.c
+++ b/dll/win32/olethk32/main.c
@@ -27,8 +27,10 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 {
     TRACE("(0x%p, %d, %p)\n",hinstDLL,fdwReason,lpvReserved);
 
+#ifndef __REACTOS__
     if (fdwReason == DLL_WINE_PREATTACH)
         return FALSE;  /* prefer native version */
+#endif
 
     if (fdwReason == DLL_PROCESS_ATTACH)
         DisableThreadLibraryCalls(hinstDLL);
diff --git a/dll/win32/pdh/pdh_main.c b/dll/win32/pdh/pdh_main.c
index cd1aed90979..56374dd67dd 100644
--- a/dll/win32/pdh/pdh_main.c
+++ b/dll/win32/pdh/pdh_main.c
@@ -76,8 +76,10 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
     TRACE("(0x%p, %d, %p)\n",hinstDLL,fdwReason,lpvReserved);
     switch (fdwReason)
     {
+#ifndef __REACTOS__
     case DLL_WINE_PREATTACH:
         return FALSE;    /* prefer native version */
+#endif
     case DLL_PROCESS_ATTACH:
         DisableThreadLibraryCalls(hinstDLL);
         break;
diff --git a/dll/win32/pidgen/main.c b/dll/win32/pidgen/main.c
index 35af226ffd2..5d64655bd33 100644
--- a/dll/win32/pidgen/main.c
+++ b/dll/win32/pidgen/main.c
@@ -33,8 +33,10 @@ BOOL WINAPI DllMain( HINSTANCE hinst, DWORD reason, LPVOID reserved )
 
     switch(reason)
     {
+#ifndef __REACTOS__
     case DLL_WINE_PREATTACH:
         return FALSE;  /* prefer native version */
+#endif
 
     case DLL_PROCESS_ATTACH:
         DisableThreadLibraryCalls( hinst );
diff --git a/dll/win32/pstorec/pstorec.c b/dll/win32/pstorec/pstorec.c
index 02cd803c116..9dc2138accc 100644
--- a/dll/win32/pstorec/pstorec.c
+++ b/dll/win32/pstorec/pstorec.c
@@ -49,8 +49,10 @@ BOOL WINAPI DllMain(HINSTANCE hinst, DWORD fdwReason, LPVOID fImpLoad)
 
     switch (fdwReason)
     {
+#ifndef __REACTOS__
     case DLL_WINE_PREATTACH:
         return FALSE;  /* prefer native version */
+#endif
     case DLL_PROCESS_ATTACH:
         DisableThreadLibraryCalls(hinst);
         break;
diff --git a/dll/win32/qmgr/qmgr_main.c b/dll/win32/qmgr/qmgr_main.c
index 7bea214ed2b..f48de877520 100644
--- a/dll/win32/qmgr/qmgr_main.c
+++ b/dll/win32/qmgr/qmgr_main.c
@@ -47,8 +47,10 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 
     switch (fdwReason)
     {
+#ifndef __REACTOS__
         case DLL_WINE_PREATTACH:
             return FALSE;  /* prefer native version */
+#endif
         case DLL_PROCESS_ATTACH:
             DisableThreadLibraryCalls(hinstDLL);
             hInst = hinstDLL;
diff --git a/dll/win32/query/query_main.c b/dll/win32/query/query_main.c
index b93973addea..a2f74c61195 100644
--- a/dll/win32/query/query_main.c
+++ b/dll/win32/query/query_main.c
@@ -40,8 +40,10 @@ BOOL WINAPI DllMain(HINSTANCE hInstDLL, DWORD fdwReason, LPVOID lpv)
 {
     switch(fdwReason)
     {
+#ifndef __REACTOS__
     case DLL_WINE_PREATTACH:
         return FALSE;  /* prefer native version */
+#endif
     case DLL_PROCESS_ATTACH:
         DisableThreadLibraryCalls(hInstDLL);
         break;
diff --git a/dll/win32/regapi/main.c b/dll/win32/regapi/main.c
index 1164e92102a..fc63925eaa1 100644
--- a/dll/win32/regapi/main.c
+++ b/dll/win32/regapi/main.c
@@ -31,8 +31,10 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 
     switch (fdwReason)
     {
+#ifndef __REACTOS__
         case DLL_WINE_PREATTACH:
             return FALSE;    /* prefer native version */
+#endif
         case DLL_PROCESS_ATTACH:
             DisableThreadLibraryCalls(hinstDLL);
             break;
diff --git a/dll/win32/resutils/resutils.c b/dll/win32/resutils/resutils.c
index b9e3c66fa1a..b5168f6e435 100644
--- a/dll/win32/resutils/resutils.c
+++ b/dll/win32/resutils/resutils.c
@@ -37,8 +37,10 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 
     switch(fdwReason)
     {
+#ifndef __REACTOS__
     case DLL_WINE_PREATTACH:
         return FALSE;  /* prefer native version */
+#endif
     case DLL_PROCESS_ATTACH:
         DisableThreadLibraryCalls( hinstDLL );
         break;
diff --git a/dll/win32/sccbase/main.c b/dll/win32/sccbase/main.c
index b263d4dc5dd..b9a894382b1 100644
--- a/dll/win32/sccbase/main.c
+++ b/dll/win32/sccbase/main.c
@@ -30,8 +30,10 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 
     switch (fdwReason)
     {
+#ifndef __REACTOS__
         case DLL_WINE_PREATTACH:
             return FALSE;    /* prefer native version */
+#endif
         case DLL_PROCESS_ATTACH:
             DisableThreadLibraryCalls(hinstDLL);
             break;
diff --git a/dll/win32/schannel/schannel_main.c b/dll/win32/schannel/schannel_main.c
index 546ad147567..f3ca9eaae9d 100644
--- a/dll/win32/schannel/schannel_main.c
+++ b/dll/win32/schannel/schannel_main.c
@@ -38,7 +38,9 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 {
 	TRACE("(0x%p, %d, %p)\n",hinstDLL,fdwReason,lpvReserved);
 
+#ifndef __REACTOS__
 	if (fdwReason == DLL_WINE_PREATTACH) return FALSE;	/* prefer native version */
+#endif
 
 	if (fdwReason == DLL_PROCESS_ATTACH)
 #ifdef __REACTOS__
diff --git a/dll/win32/scrrun/scrrun.c b/dll/win32/scrrun/scrrun.c
index c14fb130f60..3ab26e76c23 100644
--- a/dll/win32/scrrun/scrrun.c
+++ b/dll/win32/scrrun/scrrun.c
@@ -242,8 +242,10 @@ BOOL WINAPI DllMain( HINSTANCE hinst, DWORD reason, LPVOID reserved )
 
     switch (reason)
     {
+#ifndef __REACTOS__
         case DLL_WINE_PREATTACH:
             return FALSE;    /* prefer native version */
+#endif
         case DLL_PROCESS_ATTACH:
             DisableThreadLibraryCalls( hinst );
             scrrun_instance = hinst;
diff --git a/dll/win32/slbcsp/main.c b/dll/win32/slbcsp/main.c
index 4fd23be6442..a1818c0cf21 100644
--- a/dll/win32/slbcsp/main.c
+++ b/dll/win32/slbcsp/main.c
@@ -30,8 +30,10 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 
     switch (fdwReason)
     {
+#ifndef __REACTOS__
         case DLL_WINE_PREATTACH:
             return FALSE;    /* prefer native version */
+#endif
         case DLL_PROCESS_ATTACH:
             DisableThreadLibraryCalls(hinstDLL);
             break;
diff --git a/dll/win32/snmpapi/main.c b/dll/win32/snmpapi/main.c
index 3c90ca20ec9..9e5eca0d700 100644
--- a/dll/win32/snmpapi/main.c
+++ b/dll/win32/snmpapi/main.c
@@ -123,8 +123,10 @@ BOOL WINAPI DllMain(
     TRACE("(%p,%d,%p)\n", hInstDLL, fdwReason, lpvReserved);
 
     switch(fdwReason) {
+#ifndef __REACTOS__
     case DLL_WINE_PREATTACH:
         return FALSE;  /* prefer native version */
+#endif
     case DLL_PROCESS_ATTACH:
         DisableThreadLibraryCalls(hInstDLL);
         startTime = GetTickCount64();
diff --git a/dll/win32/sti/sti_main.c b/dll/win32/sti/sti_main.c
index c532ffbd6ac..8d86f65d654 100644
--- a/dll/win32/sti/sti_main.c
+++ b/dll/win32/sti/sti_main.c
@@ -137,8 +137,10 @@ BOOL WINAPI DllMain(HINSTANCE hInstDLL, DWORD fdwReason, LPVOID lpvReserved)
 {
     TRACE("(0x%p, %d, %p)\n",hInstDLL,fdwReason,lpvReserved);
 
+#ifndef __REACTOS__
     if (fdwReason == DLL_WINE_PREATTACH)
         return FALSE;
+#endif
     return STI_DllMain(hInstDLL, fdwReason, lpvReserved);
 }
 
diff --git a/dll/win32/sxs/sxs.c b/dll/win32/sxs/sxs.c
index 5b2db1d997c..884987509e1 100644
--- a/dll/win32/sxs/sxs.c
+++ b/dll/win32/sxs/sxs.c
@@ -36,8 +36,10 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 {
     switch(fdwReason)
     {
+#ifndef __REACTOS__
     case DLL_WINE_PREATTACH:
         return FALSE;  /* prefer native version */
+#endif
     case DLL_PROCESS_ATTACH:
         DisableThreadLibraryCalls( hinstDLL );
         break;
diff --git a/dll/win32/t2embed/main.c b/dll/win32/t2embed/main.c
index e47884611ce..51be86b5e50 100644
--- a/dll/win32/t2embed/main.c
+++ b/dll/win32/t2embed/main.c
@@ -32,8 +32,10 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 {
     switch (fdwReason)
     {
+#ifndef __REACTOS__
         case DLL_WINE_PREATTACH:
             return FALSE;    /* prefer native version */
+#endif
         case DLL_PROCESS_ATTACH:
             DisableThreadLibraryCalls(hinstDLL);
             break;
diff --git a/dll/win32/traffic/traffic_main.c b/dll/win32/traffic/traffic_main.c
index 6b8a9751e19..210859914de 100644
--- a/dll/win32/traffic/traffic_main.c
+++ b/dll/win32/traffic/traffic_main.c
@@ -32,8 +32,10 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 
     switch (fdwReason)
     {
+#ifndef __REACTOS__
         case DLL_WINE_PREATTACH:
             return FALSE;    /* prefer native version */
+#endif
         case DLL_PROCESS_ATTACH:
             DisableThreadLibraryCalls(hinstDLL);
             break;
diff --git a/dll/win32/url/url_main.c b/dll/win32/url/url_main.c
index aeaba70f258..d8dfdaff15b 100644
--- a/dll/win32/url/url_main.c
+++ b/dll/win32/url/url_main.c
@@ -38,8 +38,10 @@ BOOL WINAPI DllMain( HINSTANCE inst, DWORD reason, LPVOID reserved )
 {
     switch(reason)
     {
+#ifndef __REACTOS__
     case DLL_WINE_PREATTACH:
         return FALSE;  /* prefer native version */
+#endif
     case DLL_PROCESS_ATTACH:
         DisableThreadLibraryCalls( inst );
         break;
diff --git a/dll/win32/vbscript/vbscript_main.c b/dll/win32/vbscript/vbscript_main.c
index 6e6f3867559..62da59975e3 100644
--- a/dll/win32/vbscript/vbscript_main.c
+++ b/dll/win32/vbscript/vbscript_main.c
@@ -248,8 +248,10 @@ BOOL WINAPI DllMain(HINSTANCE hInstDLL, DWORD fdwReason, LPVOID lpv)
 
     switch(fdwReason)
     {
+#ifndef __REACTOS__
     case DLL_WINE_PREATTACH:
         return FALSE;  /* prefer native version */
+#endif
     case DLL_PROCESS_ATTACH:
         DisableThreadLibraryCalls(hInstDLL);
         vbscript_hinstance = hInstDLL;
diff --git a/dll/win32/wbemdisp/main.c b/dll/win32/wbemdisp/main.c
index f434eecb353..e64a7d7c5e3 100644
--- a/dll/win32/wbemdisp/main.c
+++ b/dll/win32/wbemdisp/main.c
@@ -512,8 +512,10 @@ BOOL WINAPI DllMain( HINSTANCE hinst, DWORD reason, LPVOID reserved )
 
     switch (reason)
     {
+#ifndef __REACTOS__
         case DLL_WINE_PREATTACH:
             return FALSE;    /* prefer native version */
+#endif
         case DLL_PROCESS_ATTACH:
             instance = hinst;
             DisableThreadLibraryCalls( hinst );
diff --git a/dll/win32/wmiutils/main.c b/dll/win32/wmiutils/main.c
index 9befe016bd4..c060f4b1c01 100644
--- a/dll/win32/wmiutils/main.c
+++ b/dll/win32/wmiutils/main.c
@@ -117,8 +117,10 @@ BOOL WINAPI DllMain( HINSTANCE hinst, DWORD reason, LPVOID lpv )
 {
     switch(reason)
     {
+#ifndef __REACTOS__
     case DLL_WINE_PREATTACH:
         return FALSE;  /* prefer native version */
+#endif
     case DLL_PROCESS_ATTACH:
         instance = hinst;
         DisableThreadLibraryCalls( hinst );
diff --git a/dll/win32/wmvcore/wmvcore_main.c b/dll/win32/wmvcore/wmvcore_main.c
index af23ab88b8a..6b6a4975e16 100644
--- a/dll/win32/wmvcore/wmvcore_main.c
+++ b/dll/win32/wmvcore/wmvcore_main.c
@@ -31,8 +31,10 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 
     switch (fdwReason)
     {
+#ifndef __REACTOS__
         case DLL_WINE_PREATTACH:
             return FALSE;    /* prefer native version */
+#endif
         case DLL_PROCESS_ATTACH:
             DisableThreadLibraryCalls(hinstDLL);
             break;
diff --git a/dll/win32/wshom.ocx/wshom_main.c b/dll/win32/wshom.ocx/wshom_main.c
index a44b44ce8f4..ce97c88772e 100644
--- a/dll/win32/wshom.ocx/wshom_main.c
+++ b/dll/win32/wshom.ocx/wshom_main.c
@@ -222,8 +222,10 @@ BOOL WINAPI DllMain(HINSTANCE hInstDLL, DWORD fdwReason, LPVOID lpv)
 
     switch(fdwReason)
     {
+#ifndef __REACTOS__
     case DLL_WINE_PREATTACH:
         return FALSE;  /* prefer native version */
+#endif
     case DLL_PROCESS_ATTACH:
         wshom_instance = hInstDLL;
         DisableThreadLibraryCalls(wshom_instance);
diff --git a/dll/win32/wuapi/main.c b/dll/win32/wuapi/main.c
index c2ed95ed42b..8bd38dcc85d 100644
--- a/dll/win32/wuapi/main.c
+++ b/dll/win32/wuapi/main.c
@@ -118,8 +118,10 @@ BOOL WINAPI DllMain( HINSTANCE hinst, DWORD reason, LPVOID lpv )
 {
     switch(reason)
     {
+#ifndef __REACTOS__
     case DLL_WINE_PREATTACH:
         return FALSE;  /* prefer native version */
+#endif
     case DLL_PROCESS_ATTACH:
         instance = hinst;
         DisableThreadLibraryCalls( hinst );
diff --git a/dll/win32/xinput1_1/xinput1_1_main.c b/dll/win32/xinput1_1/xinput1_1_main.c
index 04c4261a6fe..36421d2ce59 100644
--- a/dll/win32/xinput1_1/xinput1_1_main.c
+++ b/dll/win32/xinput1_1/xinput1_1_main.c
@@ -27,8 +27,10 @@ BOOL WINAPI DllMain(HINSTANCE inst, DWORD reason, LPVOID reserved)
 {
     switch(reason)
     {
+#ifndef __REACTOS__
     case DLL_WINE_PREATTACH:
         return FALSE; /* prefer native version */
+#endif
     case DLL_PROCESS_ATTACH:
         DisableThreadLibraryCalls(inst);
         break;
diff --git a/dll/win32/xinput1_2/xinput1_2_main.c b/dll/win32/xinput1_2/xinput1_2_main.c
index 04c4261a6fe..36421d2ce59 100644
--- a/dll/win32/xinput1_2/xinput1_2_main.c
+++ b/dll/win32/xinput1_2/xinput1_2_main.c
@@ -27,8 +27,10 @@ BOOL WINAPI DllMain(HINSTANCE inst, DWORD reason, LPVOID reserved)
 {
     switch(reason)
     {
+#ifndef __REACTOS__
     case DLL_WINE_PREATTACH:
         return FALSE; /* prefer native version */
+#endif
     case DLL_PROCESS_ATTACH:
         DisableThreadLibraryCalls(inst);
         break;
diff --git a/dll/win32/xinput9_1_0/xinput9_1_0_main.c b/dll/win32/xinput9_1_0/xinput9_1_0_main.c
index 04c4261a6fe..36421d2ce59 100644
--- a/dll/win32/xinput9_1_0/xinput9_1_0_main.c
+++ b/dll/win32/xinput9_1_0/xinput9_1_0_main.c
@@ -27,8 +27,10 @@ BOOL WINAPI DllMain(HINSTANCE inst, DWORD reason, LPVOID reserved)
 {
     switch(reason)
     {
+#ifndef __REACTOS__
     case DLL_WINE_PREATTACH:
         return FALSE; /* prefer native version */
+#endif
     case DLL_PROCESS_ATTACH:
         DisableThreadLibraryCalls(inst);
         break;
diff --git a/dll/win32/xmllite/xmllite_main.c b/dll/win32/xmllite/xmllite_main.c
index 63838a99f75..6315e3df668 100644
--- a/dll/win32/xmllite/xmllite_main.c
+++ b/dll/win32/xmllite/xmllite_main.c
@@ -34,8 +34,10 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 
     switch (fdwReason)
     {
+#ifndef __REACTOS__
         case DLL_WINE_PREATTACH:
             return FALSE;    /* prefer native version */
+#endif
         case DLL_PROCESS_ATTACH:
             DisableThreadLibraryCalls(hinstDLL);
             break;
diff --git a/dll/win32/xolehlp/xolehlp.c b/dll/win32/xolehlp/xolehlp.c
index 2a741f4914e..c5fde8d5315 100644
--- a/dll/win32/xolehlp/xolehlp.c
+++ b/dll/win32/xolehlp/xolehlp.c
@@ -637,8 +637,10 @@ BOOL WINAPI DllMain( HINSTANCE hinst, DWORD reason, LPVOID reserved )
 
     switch (reason)
     {
+#ifndef __REACTOS__
         case DLL_WINE_PREATTACH:
             return FALSE;    /* prefer native version */
+#endif
         case DLL_PROCESS_ATTACH:
             DisableThreadLibraryCalls( hinst );
             break;
diff --git a/sdk/include/xdk/winnt_old.h b/sdk/include/xdk/winnt_old.h
index 3de049071bf..4f1f6a1fb81 100644
--- a/sdk/include/xdk/winnt_old.h
+++ b/sdk/include/xdk/winnt_old.h
@@ -952,9 +952,7 @@
 #define DLL_PROCESS_ATTACH    1
 #define DLL_THREAD_ATTACH    2
 #define DLL_THREAD_DETACH    3
-#ifdef __WINESRC__
-#define DLL_WINE_PREATTACH    8 /* Never called, but defined for compatibility with Wine source */
-#endif
+
 #define TAPE_ABSOLUTE_POSITION 0
 #define TAPE_LOGICAL_POSITION 1
 #define TAPE_PSEUDO_LOGICAL_POSITION 2
diff --git a/win32ss/printing/base/ntprint/ntprint.c b/win32ss/printing/base/ntprint/ntprint.c
index 100385725c8..be2c5b48411 100644
--- a/win32ss/printing/base/ntprint/ntprint.c
+++ b/win32ss/printing/base/ntprint/ntprint.c
@@ -48,8 +48,10 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 
     switch(fdwReason)
     {
+#ifndef __REACTOS__
         case DLL_WINE_PREATTACH:
             return FALSE;           /* prefer native version */
+#endif
 
         case DLL_PROCESS_ATTACH:
             DisableThreadLibraryCalls( hinstDLL );
diff --git a/win32ss/printing/base/printui/printui.c b/win32ss/printing/base/printui/printui.c
index f35107fa0b2..34242da3682 100644
--- a/win32ss/printing/base/printui/printui.c
+++ b/win32ss/printing/base/printui/printui.c
@@ -219,8 +219,10 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 
     switch(fdwReason)
     {
+#ifndef __REACTOS__
         case DLL_WINE_PREATTACH:
             return FALSE;           /* prefer native version */
+#endif
 
         case DLL_PROCESS_ATTACH:
             DisableThreadLibraryCalls( hinstDLL );