If you did a File backup from the Backup and Restore panel, you should have the green arrow and CD icon with your computer name on the flash drive. By opening the Backup and Restore panel, it should allow you to find and restore whatever files you might have.
The backup folder can be opened manually and you could search for specific files that way.
If you were to have an image backup in a WindowsImageBackup folder, you can mount the .vhd files in Disk Management and get the files that way.