JPK1 (compressed archive)
From Just Solve the File Format Problem
JPK1 is the signature of a compressed archive format related to the JFX1 compressed file format.
It was used in things named "An Alien Lunch" and "The Eternal Game", by "JapoTek".
Identification
ASCII "JPK1" appears beginning 12 bytes from the end of the file.
The file most likely begins with "JFX1", the same as JFX1 format.
