This is the big can of worms of a couple of weeks back (the current one is Steam). After tons and tons of posting and fighting between ourselves, the end result is that we have no idea yet if it will work with Freetrack
I'd be interested to know as well, i had a TrackIR 4 Pro but it stopped working so i installed FT to use in the meantime before deciding if i'll get a new TrackIR camera or try to somehow repair it.