Is there any way to do a search for parts that are not used in a specific assembly? I am creating a lot of custom parts specific to an assembly. I save those parts in a folder one step down from the main assembly. I would like to compare my assembly to the parts in the folder and delete the extra files. I have tried to keep my assembly open and just delete the files but I end up with a message saying that a file is open, which is what I expected but it will not delete the files that are not open. Does anyone have a better way of doing this?