Old 16 bit application runs well but it crashed, when I try to open a file

[IBIS628]

Describe the bug

The application is for reading out/ to open driving files. It works fine, but if I try to open a file, it crashes:

**Environment

• OS: Win 10 21H2
• Version 19044.2006

I tried to create a trace, but it doesn't work, so here's the content of the cmd window, after it crashed:
Log.txt

[cracyc]

Please make a trace with the instructions from #226 (comment)

[IBIS628]

ok, now I got it
trace.txt

[cracyc]

Can you do that again with "set WINEDEBUG=+all,-snoop,-ldt,-fixup,-module,-local,-disasm,-syslevel,-thunk" (-global removed).

[IBIS628]

Okay, here is the new trace: trace.txt

[cracyc]

Try https://ci.appveyor.com/project/otya128/winevdm/builds/45066409/job/iqilrqvol1o89mw5/artifacts

[IBIS628]

It works, thanks! But it takes up to 30sec to open a little file (34kB) / up to 3min for a larger file (1MB). Sometimes there will be a Runtime Error 401 "Can't show non-modal form when modal form is displayed"
If you want to try it yourself:
Setup.zip

[cracyc]

Enabling whpx makes the program more usable but window repainting is still quite slow. I'm not sure how to get the runtime error to happen.
Edit: Some dialogs get hidden behind the main window, last commit fixes that and may fix the runtime error.

[IBIS628]

Now it's much faster and works good,. Thanks a lot! :D

[cracyc]

The slow window painting is an issue with dwm. With dwm disabled it's as fast as ntvdm is.

[IBIS628]

Thank you for continuing to work on my problem. With the new version 2370 and activated whpx it now works almost as well as with an older 32-bit operating system