I don't think any sites that explained the file internals are still up. If there are, I don't know where that would be.

A few things to point out thou. 

Poser always adds a version number to saves, and a build. The build is ignored on load, but number is not ignored and is checked on load. If you make something in P13 and want it to work without a version warning popping up when loaded, the number line either needs changed to the lowest version you will support, or removed from the file.

Setting a morph to auto apply is best done in the keys section, versus with the min/max values. That way it is still adjustable after it is loaded, but will be set to whatever you choose on load..

 For some reason I can not upload formatted text, so a screenshot will have to do. lol...

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