How to Delete a File from Retrieve WIndow?

Re: WD SmartWare (version 1.3.3.6).

I have check-marked a .jpg file I would like to delete in the Retrieve window, but when I go to the Edit drop-down menu, all of the options are greyed out, including the Delete option. 

Thanks for any tips on how to delete this file. 

You’re on an old version, what if you try an update and see if it helps?

As far as I know, 1.3.3.6 is the latest version of  WD SmartWare for Mac (see link below). 

http://www.wdc.com/wdproducts/wdsmartwareupdate/Step1.asp?id=wdfMB_Studio&os=MAC