With foobar 0.8.3 after you set the file associations, you could right click on a folder full of mp3s and have the "play/enque in foobar" option available. With 0.9, after setting the association in the preferences, the option is not available. I've found that using the old association program from 0.8.3 will make the option come up, it's just the new one included with 0.9 that doesn't have it.
I don't know if this is a bug or more of a nitpick, but I used that feature often.
