[Bug 57854] New: Steam.exe fails to start (hangs upon loading) in Wine-10.2

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=57854

Bug ID: 57854
           Summary: Steam.exe fails to start (hangs upon loading) in
                    Wine-10.2
           Product: Wine
           Version: 10.2
          Hardware: x86-64
               URL: https://cdn.cloudflare.steamstatic.com/client/installe
                    r/SteamSetup.exe
                OS: Linux
            Status: NEW
          Keywords: download, regression
          Severity: normal
          Priority: P2
         Component: ntdll
          Assignee: [e-mail]
          Reporter: [e-mail]
                CC: [e-mail]
   Regression SHA1: e7ac2e718feebd56064ed52aae0158861284af1c
      Distribution: ArchLinux

Created attachment 78073
  --> https://bugs.winehq.org/attachment.cgi?id=78073
terminal output

The Steam installer works OK, but the client hangs on starting. You don't need
to have a Steam account to reproduce this, the problem occurs right before the
login window should appear.
This occurs in WOW64 (both legacy and the new, experimental WOW64s).
Doesn't seem to happen in a pure 32-bit prefix.

Reverting e7ac2e718feebd56064ed52aae0158861284af1c
fixes the problem for me.