this was just posted at the pav, i saved a copy and am posting it here. ill keep a master copy for myself in case this violates any policies we may have regarding passwords.
Okay, quick tutorial on how to change an RPGM1 password with a hex editor.
1. Open up your memory card file (can be any kind, really) with your preferred hex editor.
2. Passwords are stored right before the game designer credits in the file, and are prefaced by 0000 0100 0000 for system files and 0100 0100 0000 for scenario files, at least in every file I've tried so far. So doing a search for those strings will lead you to the password eventually and if you see someone's name in the editor, you've found it!
3. The password is a string of 32 hex digits directly after the preface. It's easily recognizable as it's broken up into 4 digit chunks that each contain 3 zeros and 1 digit, which will be 1, 2, 4, or 8. By changing all the digits to zeroes, the password is gone and the file can be opened in the editor. Here's an example of a system password:

and a scenario password:

So there you go! You can use this to recover your work if you forget your password or take a look at something someone did that you can't figure out with this.
credit to kbandressen who posted this at the pav.