Ugh, gitlab ate a comment I spent way too long writing... Sorry for the delay. Among other things, this is a touchy area and I wanted to make sure I understood the problem completely. The tests don't pass on Helen (Geforce 2 MX, not that I expect it to matter). It appears that Windows 98 does respect the clipper in this scenario, including visually. The game in question is from 2019, and probably doesn't even work on any Windows version with that behaviour. I think the prudent thing to do is take this change anyway. I still want the tests to pass on Helen, though, so I've sent !10842, which removes the tests that don't pass, adds a couple comments, and makes a change to SetClipper() which I feel is a bit more idiomatic. Please let me know if you have concerns with it. -- https://gitlab.winehq.org/wine/wine/-/merge_requests/10723#note_139165