How to make my box parse correctly a .pls file? .pls file is shoutcast file

Ok, I'm assuming u mean to have users be prompted to open/save a .pls file as opposed to it showing up in apache? I never thought it was necessary to edit mime.types for this, but, anyways:

Edit /etc/mime.types and /usr/local/psa/apache/conf/mime.types (I don't know which one Plesk checks)

and add

text/pls pls

where is you hitting the tab key

(1 tab is enough, but this way it looks cleaner)