Blackberry Backup File Extraction

I have a number of past Blackberry V10 backup files (on my PC) that I need to extract (BLACKBERRY-620A-(06-02-2014).bbb) These are from an old Blackberry phone that I no longer have (was a work device). I have them encrypted and cannot remember the password. It seems they are attached to an old email account I no longer have access to, so cannot do password reset. I need to know if someone can extract them or access them. I'm after the files / SMS / phone calls / videos / etc that I backed up on the file. They files are large and can be accessed via a Dropbox Link. I can upload one as a trial first if needed.