I'm not sure--UR itself would not add such an extension. If this is in the item's title, you might try unchecking
Tools | Options | Import | Use document title for item title if available (or Use
page title option if importing from a web site). If it's in the item's URL attribute, please ZIP and send the original .pdf file and a .urd file with the file imported to
support@kinook.com. Thanks.