Paths with spaces don't get escaped by default. Games fail to launch without user intervention.

[ghost]

Your system information

• Steam client version (build number or date): 1716584667
• Distribution (e.g. Ubuntu): Steam Deck Stable
• Opted into Steam client beta?: No
• Have you checked for system updates?: Yes
• Steam Logs: Sorry, hope a video will do :) https://github.com/ValveSoftware/steam-for-linux/assets/163762443/946a0242-e730-422f-8973-3747c96571b0 Couldn't use gist to send this vid sry :(
• GPU: AMD

Please describe your issue in as much detail as possible:

Expected: Diablo 2 launches after providing correct install paths. Happens: Steam runs program Diablo with argument II.exe https://gist.github.com/jakubbys/4586a502763dba0fa2e7c8fb15deb0b9

Steps for reproducing this issue:

1. Launch a windows game installer.
2. Change path of executable and launch CWD.
3. Fails to launch.(part of diablo 2 lord of destruction drm is that the filename stays Diablo II.exe)

[cybik]

Adding to the ticket.

Installing a non-steam game to a path with spaces (example: Genshin Impact into Program Files) and then manually setting the launch executable to the GI launcher, results in having to add double-quotes at the start and end of the path manually in order for Steam to launch it. A workaround in this case is to install the launcher & game at the root of the WINE/Proton C: drive.

This could also be affecting the launch dir evaluation, but since the game can launch without in some cases, this is less testable.