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The backup files are of a proprietary format, intended solely as the source of data for restore to a BB. As such, they are not human-readable on the computer. But, there are plenty of 3rd party computer apps out there that can parse and present the data to you in a human readable format...search (e.g., Google) and ye shall find, I am sure.
Occam's Razor nearly always applies when troubleshooting technology issues!
If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please note that I am NOT a BlackBerry employee...these forums are a user-to-user community, not a formal support channel. Please treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.