If you have a search tool (such as "Everything" from Void Tools), look for *.lns files (that's lower case LNS, not INS). Try Cakewalk Core\Lenses\User within AppData\Roaming\Cakewalk for your user account.  For example, my custom lenses are at C:\Users\ {myAccountName} \ AppData\Roaming\Cakewalk\Cakewalk Core\Lenses\User