I'm aware that I've posted asking for the complete save file format before, and gotten a reply (but tough to get the answer, but eventually I got it), but since then there have been a number of changes to the format. I'm not sure if its anything like it was before. I'm guessing there is still a BZIP2 compressed part, and a header part, but the contents of each have probably changed.
If someone can post full documentation on the current stamp save file format, I'd be VERY grateful for the help