When I was porting a software from windows, I met a problem that the icons in the imagelist were not displaying correctly. In the Application, the correct icons are: {width=269 height=29} But when I run it under wine is like this: {width=271 height=29} When I disassable the application code I found that the Application calls ImageList_Create by given a very large cInitial, which is 0xc0c0c0. This will lead to CreateDIBSection fail. Then the source hbitmap is lost, only hMask is left and shown up on the screen. I use windbg to debug this application on windows, I found that after ImageList_Create is called on Winodws, there is a valid hbitmap handle generated. When ImageList_Add is called for 4 times, it changed and called Bitblt to copy the hbitmap already added. So I guess windows has the error handling for ImageList_Create. If CreateDIBSection failes due to the large image count, it reduced the image count. By observing the action in ImageList_Add, I think the reduced count is 1 (4x1). Then fix the cMaxImage to 1+1 which is same as ImageListImpl_Initialize to make the hbitmap expand. The example in the attachment can reproduce this bug. [imagelist.7z](/uploads/b5f7013fa9383c00bbbc38f82383ff1a/imagelist.7z) -- v6: comctl32: Fix the bug when the cInitial is too large which lead to CreateDIBSection fails. https://gitlab.winehq.org/wine/wine/-/merge_requests/10039