The 3do explorer for Windows users will make RSR files so that macs could convert and use them. However both pro pack and P5 use only pngs.. That's why the large number of them. Though with this complaint in mind I will try and make sure to convert/make rsrs for anything I give away. Though I'm sure if/when the MAC version of P5 comes along it'll toss the rsr out the door as well. Tom