Any machine that can flash your PR1.3 Fiasco image will flash the rootfs image - Just use the '-R' flag instead of '-F'. If you look at the wiki page, you can do it with 32 bit Windows; 64-bit is sort of iffy. I made my video with a Liniux LiveCD because it's pretty much foolproof - download these files, follow these steps and it -will- work. I could probably do the same with a windows livecd/image, but it's quite a bit harder to get -that- to work.