diff --git a/reactos/tools/wmc/windows.h b/reactos/tools/wmc/windows.h
new file mode 100644
index 00000000000..0c8a7d4b6f8
--- /dev/null
+++ b/reactos/tools/wmc/windows.h
@@ -0,0 +1,35 @@
+#include <wchar.h>
+typedef wchar_t WCHAR;
+typedef unsigned short int WORD;
+typedef unsigned int UINT;
+typedef unsigned int DWORD;
+typedef char CHAR;
+typedef CHAR *LPSTR;
+typedef WCHAR *LPWSTR;
+typedef const CHAR *LPCSTR;
+typedef const WCHAR *LPCWSTR;
+typedef unsigned int *LPBOOL;
+
+#ifndef __unix__
+#define STDCALL __attribute__((stdcall))
+#else
+#define STDCALL
+#endif
+
+int STDCALL MultiByteToWideChar(
+  UINT CodePage,
+  DWORD dwFlags,
+  LPCSTR lpMultiByteStr,
+  int cbMultiByte,
+  LPWSTR lpWideCharStr,
+  int cchWideChar);
+
+int STDCALL WideCharToMultiByte(
+  UINT CodePage,
+  DWORD dwFlags,
+  LPCWSTR lpWideCharStr,
+  int cchWideChar,
+  LPSTR lpMultiByteStr,
+  int cbMultiByte,
+  LPCSTR lpDefaultChar,
+  LPBOOL lpUsedDefaultChar);