How to associate mp3 files with MediaShow plugin ?

[Error404]

Ok if I press F3 on mp3 file in tcmd I get Aimp Classic opened and it starts playing music. Now I downloaded MediaShow plugin, installed it and put it on a top of my WLX (Lister plugins) list. In my knowledge (and I am starting to be suspicious on it right now) this means that I want MediaShow as a main Lister plugin because I have put it on a top of all other plugins, but still when I press F3 Aimp comes out. So what am I doing wrong and how do I make mp3 files be played by MediaShow and not Aimp ???

Thanks

[dott]

Open MediaShow.ini from the plugin's folder, in section "[FILEEXT]" must say "MP3=1", same for others file extension