You could TRY
to do it manually, but you'd have to do it for every Audio Format you want iTunes to be the default player for.
I'll use, an mp3 as an example, just do the same for any other file formats.
Find a .mp3
file on your computer.
Right click it, hover your mouse of "Open With >
" and menu will pop out the side, choose "Choose Program...
from that list, and under the browser, check the box that says "Always Use the selected program to open this kind of file".
Hope it helps
Edited by Sp0nge, 19 April 2008 - 11:16 PM.