I don't understand what happened.... My experience is that by default if you double-click to open any file it clears whatever your last playlist was. So I never use foobar as an "ad-hoc" player and always drag/drop the file/cuesheet to the playlist where I want it
C87P66: You don't have to let it clear your last playlist when you open a file! Just go to Preferences/Shell Integration and check the box "Always send files to new playlist: ('default', or whatever you put there)." That way your original playlists stay the same, just don't make any regular playlists with the same name you place here (which is always cleared the next time you open a file):
So you can indeed use Foobar as your "ad-hoc" player also--enjoy!
Haha nice! Thanks!!