The clip list is in screen coordinates so we need to map the result of
GetRandomRgn if the Windows version is win9x.

dlls/ddraw/clipper.c

diff --git a/dlls/ddraw/clipper.c b/dlls/ddraw/clipper.c
index eac48b3..d1109b3 100644
--- a/dlls/ddraw/clipper.c
+++ b/dlls/ddraw/clipper.c
@@ -157,6 +157,13 @@
             HRGN hRgn = CreateRectRgn(0,0,0,0);
             if (GetRandomRgn(hDC, hRgn, SYSRGN))
             {
+                if (GetVersion() & 0x80000000)
+                {
+                    /* map region to screen coordinates */
+                    POINT org;
+                    GetDCOrgEx( hDC, &org );
+                    OffsetRgn( hRgn, org.x, org.y );
+                }
                 if (lpRect)
                 {
                     HRGN hRgnClip = CreateRectRgn(lpRect->left, lpRect->top,