I also needed that a while back. Unfortunately though, I didn't use it. I used the last modified date and time parameter instead (which is ok for me as the files in question are never updated). My guess is that I couldn't find that magic number either. I'll be watching for any replies you might get. In the meantime if you're real desperate, there is always the workaround of redirecting and then reading the output of a LISTF,3

Costas Anastassiades,
INTRACOM SA
Athens - Greece