by Ken Task.
Have had to hack 1.9 backups before to bludgin them into submission to restore and it's tricky, but ... can be done ... even with .mbz files.
Assume you are using NotePad (a true text editor) to edit. Do NOT use Word.
The 'trick' to re-zipping is make sure the the zip extracts with certain .xml files at the 'root' of the extraction. So one creates the zip *while in* the folder that is being used to edit the xml not the folder where the edited .xml file resides. Including the other folders. Then rename the file to .mbz.
Am using a Mac and maybe this screen capture will help visualize:
All those selected would be included in the zip.
'spirit of sharing', Ken