Mine are in (D:\Steam\userdata).
And yeah, renaming is a fairly minor feature overall and is mainly for long list readability. The Aegis Project is a notable one just because the file name and the title differ more significantly than most. To be honest, I suggested manual renaming because I figured it would be easier than figuring out how to tap the API or, worse, asking you to make a list by hand!
Would it be possible to refer to a spreadsheet for the information? For example, columns for SteamID, game file name (as a default display), display title, and sort title (to avoid alphabetizing by a / an / the). Exporting the program’s current game list to a .csv, would allow a good starting point for users to manage their own lists. Alternatively, being able to reference Google sheets could could make for a good community resource. (All of the above would, of course, be ideal.)
Unrelated to the above, would it be possible for the program to automatically close and restart the game for loading saves? Perhaps with a customizable, toggle-able time delay to account for Steam cloud sync. Customizable, to account for different connection speeds (is 3 seconds a good default?), toggle-able, for those with cloud sync turned off. The restart itself should probably also be toggle-able, for those who’d rather do it themselves.
I have no idea how much is possible through Unity, so I understand if these asks are more complicated than they seem. 