Audacious

Hi, I used so much Audacious with "Ubuntu Studio" so I decided to install it in Ubuntu and Windows 7 Starter. In Win7 I run the app without installing it and it works but I noticed a strange thing: I can play all songs I have in "download" with rightclick and pushing on "Open with Audacious". But if I push "Open with Audacious" in all songs I have in "Music" Audacious says:

"Cannot open D:\user\Raccolte\Musica\Song.mp3: No such file or directory."

It appeares before in Win7 but now also in Ubuntu and I don't know how I can avoid it.

Sorry if I made some mistakes but my English is not good at all.