Backup extension is associated with Ad-aware reference files.You can try to open backup files with Ad-aware software.
Ad-aware software is generally used for saving your computer from trojans and similar harmful files. It is not enough to protect your computer from the viruses but it is good enough to avoid the risks which comes via internet explorer. The files which created by Ad-aware software are saved with backup extension.
Backup files may produced from windows7 restore function. If you need to get detailed information about the program, please check the following link.
What to use backup
which page related to backup file
backup Related Searches
You can check related links about backup fileextension.