I want to register a non-store indie game

[yamanobe96]

Sorry, I'd like to bulk register indie games in the ____.exe format that don't exist on any other platforms to Steam. . Is there a function to do that?

If possible, I'd like to be able to specify a directory and register the exe file and the .jpg file with the same name inside it as thumbnails.

[RodrigoPrestes]

Although not a perfect solution, you have the option to add on Lutris and then import with BoilR.