You can do the same but still use cramfs/zisofs - just need to figure out the offset= paramenter of loop-mount

For cramfs, you can get the offset with
Code:
grep Compressed filename -ab | cut -d: -f1
For zisofs, you can get the offset with
Code:
grep CDROM filename -ab | cut -d: -f1
For both, you can get the offset with
Code:
grep -e '\ \ \ CDROM\ \ \ \ \|Compressed\ ROMFS' /home/knoppix/Desktop/xvier.cmg -ab | cut -d: -f1
Greetings,
probono