by Colin Fraser.
Gee, haven't done this for a while.... but what used to work was
1. Rename the file to a [finename].zip
2. Unzip using 7Zip, or Winzip or any zipping program.
3. Edit the files but unless there was a reason to, leave the .xml file alone. Have done it and it worked but not really what I wanted to do.
4. Zip the file up again
5. Rename to an .mbz file.
6. Upload the file as a restore a backup to my test site first, then to the production site .
Just had a quick run through and seemed to work... but, to be honest that was not on a recent backup.