Issue description
This is most likely directly against Proton and not the game itself, but it might be helpful to mention how you are spawning the folder picker on this issue here ValveSoftware/Proton#7955 to narrow down what needs to be fixed.
Reproduction steps
- Load a save (or anew)
- Enter screenshot mode
F11 - Press
Qto change screenshot location - Try to use the dialog to pick a folder.
Game version and build number
v0.6.4d (b343)
Operating system
Linux