For historical reasons KDE is using some KDE-specific extensions
      that are currently not prefixed by a X-KDE- prefix.
    
         KDE specific keys: ServiceTypes,
         DocPath, Keywords,
         InitialPreference
        
         KDE specific types: ServiceType,
         Service and FSDevice
        
      KDE uses the following additional keys for desktop entries of the
      FSDevice type.
    
Table B.1. FSDevice Specific Keys