In Windows 2000/XP, file metadata is called Summary Information or Property Sets (in programming parlance). There is limited GUI support for editing this info on XP (using the Summary tab of the Explorer file properties dialog), but many applications do expose custom property metadata in this manner (Office, digital camera images, audio files, etc.). UR is capable of importing such metadata (and I suspect this works on Vista as well, although we haven't tested it yet).
http://www.kinook.com/UR/Manual/docu...attributes.htm
However, the reverse is not yet supported (writing UR attributes to file metadata properties when exporting documents). We'll consider adding support for this in the future.