How can I delete a location from full Acrobat search?

[Ward5DEF]

I need to use full Acrobat search to find strings in all PDF documents in several folders. I select "All PDF Documents in" and open the dropdown list. Under "Browse for Location" is a list of five folders I've already searched in. But when I specify a sixth folder and search in it, it's not added to the list, so I need to repeat the Browse for Location every time. It's as if there's a limit of five folders in the list.

Some of the folders I need frequently, but some I don't need any more. Is there a way to delete folders from the dropdown list so I can list other folders?

[Bernd Alheit]

On Windows you can remove entries in the registry.