[Bug 49559] New: winevdm.exe crashes when running 16-bit installers (Wetrix demo)

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=49559

            Bug ID: 49559
           Summary: winevdm.exe crashes when running 16-bit installers
                    (Wetrix demo)
           Product: Wine
           Version: 5.11
          Hardware: x86
               URL: https://archive.org/download/Wetdemo/wetdemo.exe
                OS: Linux
            Status: NEW
          Keywords: download, Installer, regression, win16
          Severity: normal
          Priority: P2
         Component: tools
          Assignee: wine-bugs at winehq.org
          Reporter: gyebro69 at gmail.com
                CC: julliard at winehq.org
   Regression SHA1: cee48cc78989cc2621bb98b466f80a35cfa43a12
      Distribution: ---

Created attachment 67699
  --> https://bugs.winehq.org/attachment.cgi?id=67699
terminal output

I noticed this bug when I was trying some old, 16-bit games.
Winevdm.exe crashes when I launch the installer of those games.

The problem first appeared in Wine-5.11 and the offending commit is
https://source.winehq.org/git/wine.git/commit/cee48cc78989cc2621bb98b466f80a35cfa43a12
Reverting that commit on top of Wine-5.11 fixes the crash.

Then there is a commit in 5.12 which also results in a crash in winevdm.exe.
This happens a bit later in the installer, and that is
99649d78927bb911b8a9022c8f362e0a7d9c7ea9.
I can't revert this one on top of current master and it probably needs a
separate bug report, I guess.

So let's make this bug about the crash which appeared in 5.11 and was caused by
cee48cc78989cc2621bb98b466f80a35cfa43a12.

Wetrix demo can be used to reproduce the problem. Start wetdemo.exe, click
<Yes> when the first window appears. The crash occurs at this point.

wetdemo.exe  (6.5 MB)
md5sum: 004ea256eac3f087cdaa246c004795bd

Tested in wine-5.12-166-gcaa41d4917

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