If you're using Windows you might be able to filter out .sas files in the My Recent Documents Folder.
The path is
C:\Documents and Settings\username\Recent
Get a program to read all entries in this folder and then filter for .sas is a possibility I think. Not sure if it would actually work based on the fact that its shortcuts not the actual files. Or how it gets populated, ie open file from within SAS or from contents pane, or from double click in windows.
http://support.sas.com/kb/24/707.html
I gave it a quick test try and the pipe part of the code didn't work for me, but I always have trouble with that kind of stuff.