Depends on the game engine I suppose. You can just browse up a few directories inside the prefix and find the second common place. Usually it’s c:\users<username>\appdata\ and sometimes even get stored in My Documents.
But using steam to browse files will get you directly into the prefix. After that it’s a matter of browsing around to the common locations the same as you would on windows.
You literally just right click the game in Steam and click browse files.
Don’t most games keep save files separately from the main game files?
Depends on the game engine I suppose. You can just browse up a few directories inside the prefix and find the second common place. Usually it’s c:\users<username>\appdata\ and sometimes even get stored in My Documents.
But using steam to browse files will get you directly into the prefix. After that it’s a matter of browsing around to the common locations the same as you would on windows.