“GET FILENAME” from “opened file” puzzle?

Hi,
I’m wondering if there’s a puzzle already made for this, otherwise i’ll write my own heheh.
So when you use the open file puzzle and go through the open file dialogue button for opening an open file, i get the data returned as 64 bit encoded. that’s great but id also like to get the actual FILENAME of the file that was opened.
If there exists one, what puzzle would provide that info?
thanks!