I searched a lot on google and this is what I got.
QUOTE
If you have XP Pro, run gpedit.msc, under User Config expand Admin Template > click Startmenu and Taskbar and midway through that list has 2 options: Do not keep history of recently opened documents and Clear history of recently opened documents on exit. If you enable the first option, the only side effect is that in Office, its list of opened documents aren't saved either in the File menu or the side panel.

Comment/Reply (w/o sign-up)