[Bug 50735] New: MSBuild fails to launch FileTracker

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=50735

            Bug ID: 50735
           Summary: MSBuild fails to launch FileTracker
           Product: Wine
           Version: 6.3
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ntdll
          Assignee: wine-bugs at winehq.org
          Reporter: rpisl at seznam.cz
      Distribution: ---

Created attachment 69503
  --> https://bugs.winehq.org/attachment.cgi?id=69503
WINEDEBUG=+relay,+process,+module,+loaddll BAD

MSBuild from Visual Studio build tools 2019 fails to launch FileTracker which
is needed for incremental builds. This apply for Wine 6.3 but it works on
Staging. I bisected this to wow64cpu patchset which is tracked in bug 45567.

Then I found that there are patches for wow64cpu on the list for upstream. But
these don't fix the problem. So after investigating this further I've found
this: what really fixes the problem is calling load_builtin_dll() in
process_init() and this builtin dll must not be in PE format. If -mno-cygwin is
enabled, it does not work. It is not important which exports the library has,
no need for setting Wow64Transition.

I'm attaching two traces - good and bad. Maybe someone could identify what is
happening here.

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