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Many scripts I tested end with this :

08/02/19 22:18:58 - [POL_Call] Message: ----- Ending function POL_Install_steam -----
08/02/19 22:18:58 - [POL_Wine] Message: Running wine- steam.exe steam://install/25980 (Working directory : /home/me/.PlayOnLinux/tmp)
wine: cannot find L"C:\\windows\\system32\\steam.exe"

 

For example: https://www.playonlinux.com/en/app-3519.html

I used to install Steam from the PlayOnLinux packages, but haven't done it for a long time.

I have always downloaded the SteamSetup.exe from Steampowered.com and installed it.

What is up with the double slashes //?

C:\\Windows\\system32\\steam.exe

I don't know, I have none experience with POL + Steam.

Thats fine...

Its clearly the path to Steam but normally Linux uses forward slashes and Windows uses backslashes.  But in your error it uses double backslashes... kinda strange.