LW only searching files that only open in MP3 Sound Format and not MPEG-4 Audio file.

[featheree]

LW is only searching/resulting w/the files that have the MP3 Sound Format in it, these open up only in Windows media player...I have always been downloading files w/ the MPEG-4 Audio File, which I can click on in the completed downloads box and they automatically open in my Itunes library. I have LW 4.18.8 and Java 1.6.0_05. I just downloaded the new LW and noticed that it started doing this when i upgraded. I also noticed that when i upgraded to the new LW that there was a choice of the two kinds of files but the next time i searched there was only the MP3 file that opened in Windows media player...It also seems to depend on who I am searching for that I even get the choice. But mainly it's always the MP3...
I have Windows XP, broadband and search from my house, I share all my music, and have looked and looked and looked to see what I could change.
Oh and I also recently tried to switch from IE to Safari and went back to IE b/c of kinks w/ safari.