You mean you unpack your DOS games directly to your drive C: ?
Or do you have a dedicated subdirectory for them ?
If it's the first, then I strongly suggest you change that habit. When your games are in a single directory (which
is not your drive C
, it's far easier to manage and run them in DosBox.
Once you have made a directory to put your games in, move the appropriate games there.
In DosBox:
mount C C:\[the name of your games directory]