https://bugs.winehq.org/show_bug.cgi?id=46658
--- Comment #2 from Béla Gyebrószki gyebro69@gmail.com --- (In reply to Fabian Maurer from comment #1)
First, can you check if the program uses the comctl32 version or user32 version of the combobox? You can tell my looking at the manifest that's embedded as resource into the exe file.
How can I achieve that manifest thing? At least native comctl32.dll doesn't fix the problem.