if ffxp is going to be released on os other than Windows, it's going to be multi-platform, like linux/unix/bsd/osx...
tho don't hold your breath for this.
you'll have better luck running current flashfxp using
http://darwine.opendarwin.org/ or VirtualPC
quiet a few users are using Wine on linux to run flashfxp, haven't heard of anybody trying it on osx