Scan folders for already downloaded games

Some other launchers or programs have a feature for scanning a folder for downloaded games and adding them to the library. For example, Nvidia App and GOG Galaxy have this feature. So, the path would be something like this:

1. I have a folder with Game 1, Game 2, etc.

2. In the launcher, I click a button like "Scan Folder"

3. I select the folder where these games are located

4. The launcher automatically scans all subfolders and looks for games in them

5. After the scan is complete, I see a list of Game 1, Game 2, etc. in the library

I know you can manually specify the path to the .exe file or add the game to the library first and then launch it, but this takes a long time if there are a lot of games or they take a long time to launch.