FourCC: "TAPE"

Does anyone what type of file this is? I read the first 4 bytes from this 33 MB file I have on my disk and they were "TAPE". I checked around but couldn't find a registered FourCC for this code; the only guess I could make is a back-up for a tape drive possibly?

http://filext.com/file-extension/BKF
http://forums.mysql.com/read.php?60,6224,6224
http://www.google.com/search?q=%2254+41+50+45%22

hmm... interesting... considering the size and where I got it from I think the MySQL backup would probably make the most sense then, thanks.