If the fccHandler is mmioFOURCC(0, 0, 0, 0) the AVI is also
uncompressed.
infoPtr->hWnd wasn't updated in ANIMATE_OpenA.

dlls/comctl32/animate.c

diff --git a/dlls/comctl32/animate.c b/dlls/comctl32/animate.c
index 3dc0702..672101d 100644
--- a/dlls/comctl32/animate.c
+++ b/dlls/comctl32/animate.c
@@ -616,7 +616,8 @@
 
     /* check uncompressed AVI */
     if ((infoPtr->ash.fccHandler == mmioFOURCC('D', 'I', 'B', ' ')) ||
-       (infoPtr->ash.fccHandler == mmioFOURCC('R', 'L', 'E', ' ')))
+       (infoPtr->ash.fccHandler == mmioFOURCC('R', 'L', 'E', ' ')) ||
+       (infoPtr->ash.fccHandler == mmioFOURCC(0, 0, 0, 0)))
     {
         infoPtr->hic = 0;             
 	return TRUE;
@@ -665,6 +666,7 @@
     HINSTANCE hInstance = (HINSTANCE)wParam;
 
     ANIMATE_Free(infoPtr);
+    infoPtr->hWnd = hWnd;
 
     if (!lParam) {
 	TRACE("Closing avi!\n");