LIST OF FILE HEADERS:
~~~~~~~~~~~~~~~~~~~~~
 00 FD  - ZShell programs
 00 FB  - Usgard 1.0 programs

PROGRAMS:
~~~~~~~~~
(first byte=game,second byte could be [save game,level,hiscore,...] 
 01 00  - Plainjump II level file
 02 00  - Sqrxz world (not compressed)
 02 01  - Sqrxz compressed world
