http://bugs.winehq.org/show_bug.cgi?id=59550 --- Comment #6 from Eric Pouech <eric.pouech@gmail.com> ---
This indicates that when wcmd receives this string as its starting argument via /c from an external process (e.g. main game engine binary Unreal Engine 5), it is misinterpreting the first forward slash in the path as a switch. this error message can be printed while trying to interpret any command (either passed with /c or when executing a .bat or .cmd with that command...)
when this happens running with WINEDEBUG=+process,+cmd,+start could log some more information it's very likely that the issue needs also to use path:s with spaces inside (in the log you provided both the target .bat and the current path contain spaces) -- Do not reply to this email, post in Bugzilla using the above URL to reply. You are receiving this mail because: You are watching all bug changes.