This is writing to the list. Poster wants writing to the file  stream
itself. If you right-click on a file on your system and choose properties  you
should see a tab for Summary info. Poster wants to add data  there.

Check out this link. I know it’s a subscription service but you should be able
to scroll all the way to the bottom and find more information. It seems there is
a .dll on MSDN somewhere...