Fixed a couple of function prototypes.
diff --git a/dlls/msacm/wineacm.h b/dlls/msacm/wineacm.h
index abbb4f8..e28c948 100644
--- a/dlls/msacm/wineacm.h
+++ b/dlls/msacm/wineacm.h
@@ -405,7 +405,7 @@
 extern HINSTANCE MSACM_hInstance32;
 
 /* From pcmcnvtr.c */
-LRESULT CALLBACK	PCM_DriverProc(DWORD dwDevID, HDRVR hDriv, UINT wMsg,
+LRESULT CALLBACK	PCM_DriverProc(DWORD_PTR dwDevID, HDRVR hDriv, UINT wMsg,
 				       LPARAM dwParam1, LPARAM dwParam2);
 
 /* Dialog box templates */