How to clear the history of the dropdown list (Combo box)

Can we clear the history of all dropdown lists (combo boxes) such as the dropdown list of the "Set Description" dialog, ...? I think sometimes it is "full" of items. In Total Commander, just press Shift+Delete to delete an item of the dropdown list. Does Directory Opus have such hotkey or built-in command to do that or i must browse to the C:\Documents and Settings\User\Local Settings\Application Data\GPSoftware\Directory Opus\State Data and reset some osd files ? Please help, thanks.

Put this in a button and it will clear the Set Description drop-down history:

delete "/dopuslocaldata\State Data\MRU\comment.osd" QUIET

Thanks. Got it.
MRU folder contains osd files to store history of many actions, so are there any problems if i delete this folder to clear the history of all actions?

I don't know of any problems that'd result from that. Should be fine.

Yes, should be fine. I gave it a try. You delete this MRU folder and it will be recreated to store the history when we restart Directory Opus. Thanks for your reply.