Partial implementation of MsiGetFileVersionA/W.

diff --git a/include/msi.h b/include/msi.h
index f461e99..5d9a17b 100644
--- a/include/msi.h
+++ b/include/msi.h
@@ -246,6 +246,10 @@
 INSTALLSTATE WINAPI MsiQueryFeatureStateW(LPCWSTR szProduct, LPCWSTR szFeature);
 #define MsiQueryFeatureState WINELIB_NAME_AW(MsiQueryFeatureState)
 
+UINT WINAPI MsiGetFileVersionA(LPCSTR szFilePath, LPSTR lpVersionBuf, DWORD* pcchVersionBuf, LPSTR lpLangBuf, DWORD* pcchLangBuf);
+UINT WINAPI MsiGetFileVersionW(LPCWSTR szFilePath, LPWSTR lpVersionBuf, DWORD* pcchVersionBuf, LPWSTR lpLangBuf, DWORD* pcchLangBuf);
+#define MsiGetFileVersion WINELIB_NAME_AW(MsiGetFileVersion)
+
 /**
  * Non Unicode
  */