Where is the steam authorization file?
Andrew Patterson
Published Jul 08, 2026
My steam installation was having some weird problems, so I "reinstalled" steam by deleting everything EXCEPT:
steamapps/
userdata/
Steam.exe
This caused steam to redownload all its files. On launch I get the login prompt, I type in my authentication details, but when I click Login, Steam asks to authorize my machine.
My old steam files are still in my trash bin. What is the "authorization file" called? I want to copy it back to my current steam folder. I don't think this action should cause problems since it's the same machine.
1 Answer
Your Steam Authorisation file is the two ssfn[Some Numbers] (Steam Sentry File) found in the base folder.
When switching auth files, ensure that you copy both ssfn* files.
One of them is a hidden file.
Warning: This file can be used to bypass all two-factor authentication, so keep it safe and DO NOT give it to anybody (not even upload it anywhere).
To be on the safe side, don't make any backups of it. Besides, you can always generate a new one with a new installation of Steam.
