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Still works for me. Just to make sure, you are not launching Galaxy or Witcher with admin rights, are you?
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teleguy: Still works for me. Just to make sure, you are not launching Galaxy or Witcher with admin rights, are you?
I was looking for this and tried this guide, although it does not work for me. It seems like there is nothing like cscript.exe in my System32 folder. Do you know, how to solve this? Thank you in advance!
What about the SysWOW64 folder?
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darthspudius: Curious, did anyone get this to work?
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teleguy: Yes.

Download https://www.dropbox.com/s/zgsxb0pdf50hxmf/SteamOverlayFix.zip?dl=0 and extract the files to the directory where GOG Galaxy is located.

Adjust the file paths to Witcher 3 and the Galaxy Client in SteamOverlayFix.ini with notepad (if necessary).

Add GOG Galaxy to the Steam client as a non-Steam game.

Rightclick on the new Galaxy entry on the Steam client->Properties and overwrite the Target field with

"C:\Windows\System32\cscript.exe" "C:\Program Files (x86)\GalaxyClient\SteamOverlayFix.vbs"
(adjust the file path if you didn't install Gog Galaxy in "C:\Program Files (x86)\GalaxyClient\")

You can now launch Gog Galaxy from the Steam client and in turn Witcher 3 from GoG Galaxy. The Steam overlay will work and Galaxy will track your playtime.

The script was found here:
https://github.com/lemasato/Steam-Overlay-for-Launchers/releases
THIS IS FANTASTIC! Thank you very much!
Though it would be awesome if it was included in Galaxy without this tinkering.