Nice work
@RhianB.
I have Snow Leopard on both an original MacBook1,1 and a MacBookPro1,1. On the MBP, iTunes kept failing to open, but it was working fine on the MB.
For some reason, the iTunes.app must have been missing a bunch of resources, because here is the Get Info size calculation on the MBP (which wasn't launching)..
And here it is again on the MacBook, which was working;
I just zipped up iTunes.app and copied it across to the MBP, replaced the previous (smaller) copy of iTunes, double clicked and all was A OK again.
How bizarre...