Restoration of 2.2.3 to 2.2.6

Hi folks,

Environment:

• MAMP Pro
• PHP 5.4.4.
• Moodle 2.2.6, build 20121116

I've backed-up a course from a Moodlerooms 2.2.3 installation to test a restoration on a completely vanilla 2.2.6 install. I ran into the error described here: http://docs.moodle.org/22/en/error/moodle/wrong_setting_level_moodle_backup_xml_file.

I was able to find the offending <setting>...</setting> and removed the appropriate lines.

Here's what's puzzling to me:

1.) If this was installed on an existing 2.2.3 site, why were those lines still there?
2.) the post suggests compressing the file back to .mbz format...what utility is used to do this?

Many thanks for any guidance.

rtb