Folders open with Audacious

[Taxicletter]

Hello,

Since I used Audacious one time, when I select a folder from the Launch Bar with the Foldermenu, Audacious opens.
When I open a folder from my desktop, it opens as it should, as a folder.

Where can I change this error?

Thank you

(Also: i installed the Debian FAQ from the software center, but I can't find it. Using "which debian" in the terminal returns nothing (I did "sudo updatedb" first).

[Taxicletter]

For future reference:
I right clicked a folder and choose the default program to open, being the file manager.