Moskus,
The only file I know remotely similar to that would be a *CAL file: CakeWalk Application Language.
You haven't renamed the file accidentally by any chance?
Here's a trick I've used in the past for such occasions: Rename the file to *.TXT and open it with a text editor. If you can read the header, it may give you an idea of what the file-type is, then you can re-name the file-extension appropriately.
--
BluesMeister