diff --git a/reactos/lib/fmifs/compress.c b/reactos/lib/fmifs/compress.c
index c07e7e57484..66b2e807332 100644
--- a/reactos/lib/fmifs/compress.c
+++ b/reactos/lib/fmifs/compress.c
@@ -1,4 +1,4 @@
-/* $Id: compress.c,v 1.2 2004/02/23 11:55:12 ekohl Exp $
+/* $Id: compress.c,v 1.3 2004/09/15 13:32:26 weiden Exp $
  *
  * COPYING:	See the top level directory
  * PROJECT:	ReactOS 
@@ -12,14 +12,42 @@
 #define UNICODE
 #define _UNICODE
 #include <windows.h>
+#include <winioctl.h>
 #include <fmifs.h>
 
 
-/* FMIFS.4 */
-BOOLEAN STDCALL
+/*
+ * @implemented
+ */
+BOOL STDCALL
 EnableVolumeCompression (PWCHAR DriveRoot,
-			 BOOLEAN Enable)
+			 USHORT Compression)
 {
+  HANDLE hFile = CreateFileW(DriveRoot,
+                             FILE_READ_DATA | FILE_WRITE_DATA,
+                             FILE_SHARE_READ | FILE_SHARE_WRITE,
+                             NULL,
+                             OPEN_EXISTING,
+                             FILE_FLAG_BACKUP_SEMANTICS,
+                             NULL);
+  
+  if(hFile != INVALID_HANDLE_VALUE)
+  {
+    DWORD RetBytes;
+    BOOL Ret = DeviceIoControl(hFile,
+                               FSCTL_SET_COMPRESSION,
+                               &Compression,
+                               sizeof(USHORT),
+                               NULL,
+                               0,
+                               &RetBytes,
+                               NULL);
+
+    CloseHandle(hFile);
+
+    return (Ret != 0);
+  }
+  
   return FALSE;
 }
 
diff --git a/reactos/lib/fmifs/format.c b/reactos/lib/fmifs/format.c
index 667b6899a9d..221a25283f7 100644
--- a/reactos/lib/fmifs/format.c
+++ b/reactos/lib/fmifs/format.c
@@ -1,4 +1,4 @@
-/* $Id: format.c,v 1.4 2004/02/23 11:55:12 ekohl Exp $
+/* $Id: format.c,v 1.5 2004/09/15 13:32:27 weiden Exp $
  *
  * COPYING:	See the top level directory
  * PROJECT:	ReactOS 
@@ -12,6 +12,7 @@
 #define UNICODE
 #define _UNICODE
 #include <windows.h>
+#include <ntddk.h>
 #include <fmifs.h>
 #include <fslib/vfatlib.h>
 #include <string.h>
diff --git a/reactos/lib/fmifs/makefile b/reactos/lib/fmifs/makefile
index 7038f4ae836..dcb8a0f887f 100644
--- a/reactos/lib/fmifs/makefile
+++ b/reactos/lib/fmifs/makefile
@@ -1,4 +1,4 @@
-# $Id: makefile,v 1.22 2004/05/29 21:24:43 hbirr Exp $
+# $Id: makefile,v 1.23 2004/09/15 13:32:27 weiden Exp $
 
 PATH_TO_TOP = ../..
 
@@ -10,7 +10,7 @@ TARGET_BASE = $(TARGET_BASE_LIB_FMIFS)
 
 TARGET_ENTRY = _InitializeFmIfs@12
 
-TARGET_CFLAGS = -fno-builtin -Werror -Wall
+TARGET_CFLAGS = -fno-builtin -Werror -Wall -D__USE_W32API
 
 # require os code to explicitly request A/W version of structs/functions
 TARGET_CFLAGS += -D_DISABLE_TIDENTS