Did a bit of research and found these...
http://filext.com/detaillist.php?extdetail=qf
Of course, it would have helped if you had posted a bit more information like where you got or saw the file, what came with it, what you thought it was when you got it, how big it is, and anything else you can think of. Even trivial facts help.
And, run against the TrID program and see what it reports. The on-line version is at...
http://marcopon.trustedwebhost.com/onlinetrid/trid.aspx
If the file is large, use the downloadable version...
http://mark0.ngi.it/soft-trid-e.html