View jg4/jg6 format/s?

[Drahken]

I have a jigsaw puzzle program and its puzzles appear to be modified BMP files (based on filesize). I have a lot of these, and it would make it much easier to keep organized if I could use xnview to view & move them. There are 2 file extensions, jg4 and jg6, presumably they are the same basic format, but with 6 being a later revision. Here are sample files:
JG4 format: http://www.divshare.com/download/24303123-fdb
JG6 format: http://www.divshare.com/download/24303124-a83

I also have a second jigsaw puzzle program which uses a different format. Again, it'd be nice to be able to view & organize them using xnview. Here is a sample of this format:
JSM format: http://www.divshare.com/download/24303130-39c

[xnview]

ok i'll check