There is only one file type that uses the .OBW extension:
Superior Drummer Sounds File
File used by Superior Drummer, a program used for making drum tracks; contains a library of drum sounds saved in a proprietary, compressed format; includes many different kick, snare, tom-tom, hi-hat, and cymbal sounds, as well as other drum sounds.
|Toontrack Superior Drummer||Paid|
Updated: November 16, 2012