diff --git a/reactos/lib/userenv/precomp.h b/reactos/lib/userenv/precomp.h
new file mode 100644
index 00000000000..8af0540d088
--- /dev/null
+++ b/reactos/lib/userenv/precomp.h
@@ -0,0 +1,83 @@
+#ifndef __USERENV_PRECOMP_H
+#define __USERENV_PRECOMP_H
+
+#define NTOS_MODE_USER
+#include <ntos.h>
+#include <windows.h>
+#include <userenv.h>
+#include <tchar.h>
+#include <stdio.h>
+
+/* debug.h */
+void
+DebugPrint (char* fmt,...);
+
+#define DPRINT1 DebugPrint("(%s:%d) ",__FILE__,__LINE__), DebugPrint
+#define CHECKPOINT1 do { DebugPrint("%s:%d\n",__FILE__,__LINE__); } while(0);
+
+#ifdef __GNUC__
+#define DPRINT(args...)
+#else
+#define DPRINT
+#endif	/* __GNUC__ */
+#define CHECKPOINT
+
+/* directory.c */
+BOOL
+CopyDirectory (LPCWSTR lpDestinationPath,
+	       LPCWSTR lpSourcePath);
+
+BOOL
+CreateDirectoryPath (LPCWSTR lpPathName,
+		     LPSECURITY_ATTRIBUTES lpSecurityAttributes);
+
+BOOL
+RemoveDirectoryPath (LPCWSTR lpPathName);
+
+/* misc.c */
+typedef struct _DYN_FUNCS
+{
+  HMODULE hModule;
+  union
+  {
+    PVOID foo;
+    struct
+    {
+      HRESULT (STDCALL *CoInitialize)(LPVOID pvReserved);
+      HRESULT (STDCALL *CoCreateInstance)(REFCLSID rclsid, LPUNKNOWN pUnkOuter, DWORD dwClsContext, REFIID riid, LPVOID * ppv);
+      HRESULT (STDCALL *CoUninitialize)(VOID);
+    };
+  } fn;
+} DYN_FUNCS, *PDYN_FUNCS;
+
+typedef struct _DYN_MODULE
+{
+  LPWSTR Library;    /* dll file name */
+  LPSTR Functions[]; /* function names */
+} DYN_MODULE, *PDYN_MODULE;
+
+extern DYN_MODULE DynOle32;
+
+BOOL
+LoadDynamicImports(PDYN_MODULE Module, PDYN_FUNCS DynFuncs);
+
+VOID
+UnloadDynamicImports(PDYN_FUNCS DynFuncs);
+
+LPWSTR
+AppendBackslash (LPWSTR String);
+
+BOOL
+GetUserSidFromToken (HANDLE hToken,
+		     PUNICODE_STRING SidString);
+
+/* profile.c */
+BOOL
+AppendSystemPostfix (LPWSTR lpName,
+		     DWORD dwMaxLength);
+
+/* registry.c */
+BOOL
+CreateUserHive (LPCWSTR lpKeyName);
+
+#endif /* __USERENV_PRECOMP_H */