Java 7 API Files.getowner returns S-1-5-21-1256266458-1619763451-1018739985-1218

Hi. i'm accessing the files residing on my remote hp-ux system on my windows system through the samba map-drive. When i use the api Files.getowner() for a file under the C:, it returns the owner of the file. but if i use the same API for a file under the map-drive, it returns a sequence of digits like S-1-5-21-1256266458-1619763451-1018739985-1218.
can anyone tell me how to obtain the owner of the file in the samba map drive?

As far as I know, this is an internal user ID which Windows displays when it cannot - for some reason - translate it to the real user name.

I don't know how Samba provides file and folder owners to Windows, but I'd say that Windows are unable to find that user. That user exists on unix, it probably doesn't have any relationship to the Windows machine accessing the share. You'd probably have to set both systems in a way which would allow them to share user definitions (eg. put them both to a Windows domain) to be able to display the user name on Windows. (Just guessing.)