NSL Scanner not detecting newly installed GOG games (September/October 2025)

[ksawerion-web]

I’ve been using NonSteamLaunchers on my Steam Deck for GOG Galaxy. A few weeks ago, everything worked fine: games installed through GOG Galaxy (e.g. LEGO Star Wars) were detected by the NSL scanner and automatically added to my Steam library.

Now, since mid-September 2025, I noticed that newly installed GOG games are not detected by the scanner anymore, even though they install and run perfectly inside GOG Galaxy.

Examples:

LEGO Star Wars → detected correctly.

BioShock 2 Remastered and The Smurfs (installed recently) → run fine in GOG Galaxy, but the NSL scanner does not add them to the Steam library.

Additional info:

Install location: SD card (D:).

GOG Galaxy runs smoothly with GE-Proton 10-17.

The issue is not game-specific: all new installs are skipped by the scanner.

Two weeks ago I completely removed all launchers and the NSL plugin, cleaned up everything, and then reinstalled them from scratch. The problem still persists.

This makes me think it is not a leftover config problem, but rather a recent bug related to how the scanner reads GOG manifests.

Expected behavior:
Newly installed GOG games should be detected by NSL’s scanner and automatically added to Steam, just like before.

Workarounds tried:

Full clean reinstall of NSL + GOG → issue remains

Re-scanning in NSL → still skipped

Conclusion:
Looks like the scanner currently fails to read new GOG installs, even though Galaxy itself recognizes them. Likely caused by a recent change in GOG manifests or NSL parsing logic.

[moraroy]

try now, i updated the Desktop Version, NonSteamLaunchers.desktop

[ksawerion-web]

It is now recognizing again the games but for bioshock 2 remastered it's adding new start option with fixed proton path, and has in general different settings. But the smurfs is correct as before. Do I have to change something ?

Btw. What do I need to do if the game is being recognized by the scanner after I deleted the game in GOG?

Thanks in advance!

[moraroy]

@ksawerion-web what were settings for bioshock remastered before?

[ksawerion-web]

Usually it looks like this:

But now it looks like this:

Complete start option:
STEAM_COMPAT_DATA_PATH="/home/deck/.local/share/Steam/steamapps/compatdata/NonSteamLaunchers/" WINEPREFIX="/home/deck/.local/share/Steam/steamapps/compatdata/NonSteamLaunchers/pfx" GAMEID="409720" PROTONPATH="/home/deck/.steam/root/compatibilitytools.d/UMU-Proton-9.0-4e" %command% /command=runGame /gameId=1482265668 /path="D:/NSL/GOG/Games/BioShock 2 Remastered/Build/Final/Bioshock2HD.exe"

I don't know what is happening with Bioshock 2.
It is removing and adding the game every 2 secs to the steam library.
But only one entry - the second entry is remaining in the library (I got two entries in the steam library. I guess because I added one .exe inside the GOG Game configuration once.
The second entry is still being added and removed every 2 seconds after deinstalled the game in GOG.

It is also still remaining when I reinstalled the game and set the GOG game configuration to default.

PLease help :D

[moraroy]

@ksawerion-web one game is umu based (bioshock) one is not (smurfs). as for it re- adding i would stop the scanner and make sure bioshock is installed and manually delete all bioshock shortcuts

[ksawerion-web]

Okay make sense! Thanks

I cannot solve the problem with the adding issue.
Below you can find a video of its behavior.

I get crazy :D

P.S. it stoppes when I go in gaming modus and deactive auto scanning

Video_2025-10-04_14-24-33.mp4

[moraroy]

@ksawerion-web that's because you have the decky loader plugin version installed and running the scanner.... I have not updated the plugin just yet with any new code. Please stop the scanner in Game mode.