Printed doc topics listed in WinXP Recent Documents list
I recently upgraded to RoboHelp 9 from 7. I generated a printed doc and each topic is listed in the Recent Documents list in Windows XP, as follows:

The file names all begin with $HtmlDoc_Chapter_... By the way, these files can't be found once you click one of the names. It looks like some temporary files made during generation. The point is, I don't want them in my Recent Documents list. How can I prevent this from happening?
Thank you.
