how can I mount a ab backup file from windows? And would I be able to point an undelete program on it? I see this Does rooting erase anything?  about making an ab backup file.
how can I mount an ab backup file from windows? And would I be able to run an undelete program on it or on the image?
I see this question How do I open a .ab file on my computer  but it doesn't answer what i'm asking because he is asking and was understood to be asking specifically about some firefox tabs.
Android backup files created via adb backup are no images, they are more comparable to ZIP files. Only existing files are included into the backup file. Deleted files can not be included in such an Android backup.
Therefore you will never be able to run an undelete program on an adb backup file.
The only backup files that would make sense to use an undelete program on are NANDroid backup files as those backups files contain one or more whole partition(s).