the Native VPP does not allow storing meta data. It will happily accept it through the file manager, but nothint is really persisted.
This will do the trick (should also work fine on CMS 6):
I'm just wanting to check, but does the VirtualPathNativeProvider support the storing of file summary information?
Currently EPiServer allows us to save the information when we upload the file, but we when we try retrieving it the information is always blank.