My condolences.
I can't imagine what it must feel like for you

Whew...glad (!) to see that I'm not the only one with this problem.

It never happened before, though -- Windows 7 and Outlook 2010, no problem; Windows 8/8.1 and Outlook 2010 or 2013, no problem. It's got to be something which the combination of Windows 10 and Outlook is creating.

BTW, yes, going into the context menu after right clicking on FARR, then copying, and then pasting with CTRL-V in Outlook works. The trouble is that going into the context menu and then mousing to 'copy' is an extra and time-consuming step. A CTRL-C on the FARR window which copies the file rather than the filename would be helpful, as suggested by Skajfes -- although a working drag and drop would be miles better!

Hopefully, Mouser's genius will resolve the problem! Very difficult to work without FARR...