The .mbp file encodes information about your reading including annotations and the last position read. It was used in old Kindle devices, newer ones use a different file format to store this information. There is some cryptic documentation on it
here.
I an not aware of any software that can parse this file, but something very old probably exists somewhere.
If you can find where the position number is encoded in the file you can divide it by 150 to obtain the corresponding location number. You can then enter that into the "go to" menu on your kindle to return to that place in the book.