Originally Posted by jsconyers
Welcome to the forums.
Did you use Desktop Manager to create the backup? If so, you should see something like LoaderBackup-(2009-09-29).ipd. Search your PC for ipd files. They will be your backup files.
It should be as easy as "Restore Back-Up", and select like jsconyer has mentioned your latest backup file and everything should be loaded back in.
EDIT: You shouldn't be able to open the file on your computer, it is formatted for a blackberry device.