[Bug 51457] The 32-bit version:install fails in 64-bit wineprefixes

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=51457

--- Comment #1 from François Gouget <fgouget at codeweavers.com> ---
Notes from a 64-bit Windows 10 machine:
* Windows has the same two regedit.exe files; plus some in WinSxS\amd64_*. So
the WinePrefix layout seems ok (in particular c:\Windows\system32\regedit.exe
does not exist).
* GetSystemDirectoryA() returns "C:\windows\system32" regardless of the process
bitness. Again this matches Wine.
* Yet calling CreateFileA("C:\windows\system32\regedit.exe") in a 32-bit
process on a 64-bit Windows succeeds while it fails in a 64-bit process. Again
this matches Wine.
* But that last point causes file_existsA() to return TRUE instead of FALSE,
which is why VerFindFileA() does not return VFF_CURNEDEST.

So the bug seems to be in the file_existsA() / VerFindFileA() implementation
which fails to take the WoW32 case into account.

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