[Bug 47514] AviUtl: Can' t add a file to the ExEdit dialog after the first drop.

https://bugs.winehq.org/show_bug.cgi?id=47514

--- Comment #1 from Sagawa  ---
Created attachment 64905
  --> https://bugs.winehq.org/attachment.cgi?id=64905
drag and drop demo

After the investigation, I figured out that DragQueryPoint's return value
causes the issue.

I prepare a demo application for the behavior. Please execute drop_win.exe with
Wine and drop a file into the window.
The second line shows DragQueryPoint's result and its return value.
The return value is expected to be TRUE. But it's FALSE with Wine 4.12.1.