There is one other file type using
the XP file extension!
.xp - WindowBlinds temporary data
XP file extension - Fasttracker pattern
What is xp file? How to open xp files?
File type specification:
The XP file extension is related to Fasttracker and used for files that contain a song pattern saved by the Fasttracker audio tracker. It can be used with other patterns to create a complete song, or .XM module.