https://bugs.winehq.org/show_bug.cgi?id=46846
--- Comment #7 from Hans Leidekker hans@meelstraat.net --- (In reply to Alexandre Julliard from comment #6)
Probably a variant of bug 46638.
Yes, now it's windowscodecs that fails to load when the dialog code tries to fetch the splash screen bitmap. Starting the installer with 64-bit msiexec works around the problem.
This suggests restarting msiexec 64-bit as a solution, but it doesn't cover installers that call MsiInstallProduct directly. We could continue down the path of making sure the necessary dlls are loaded up front, but maybe it's better to turn this upside down and disable fs redirection only for the sections where it's absolutely needed. That way it's easier to guarantee that we don't need to load any dlls.