While attempting to restore files from an NTBackup .bkf file, you might find a reference to the Windows NT Backup Restore Utility for Windows 2008 Server and not Windows 2008 Server R2.  If attempting to install the former, you'll be greeted with an error which basically states you need to add the feature "Removable Storage Manager" but you are unable to locate this feature. 

This feature is not available on Windows 2008 Server R2 nor will that version of the Backup Restore Utility work for you. 

If you follow this link:

http://support.microsoft.com/kb/974674

You can get the Hotfix via email from Microsoft which contains the correct utility.