thats an XP fault
sometimes my comp goes weird and like, all my .exe icons change to a notepad icon
or like all my .jpg icons turn to a .html icon
very odd, prob just coz my comps so dumb
and to install the MatrixMSN you just install normal MSN, go to the MSN dir (Program Files\MSN Messenger) and then swap the 2 exe's and .dll's... restart msn and you done