No instruments on import manager!

Hi!
When I import a .midi file with many tracks on it, MuseScore detects it and everything is cool and fine. However, when i try to change the instrument within the import manager (which appears at the bottom automatically after opening the .midi file) i can only choose piano, grand piano, toy piano and i dont know what else. I am trying to put woodwinds, brass, etc.

I couldn't get the screenshot with the mau popping out... but those are the only options that i get!

Please help!!!
Thanks