I'd like to be able to copy the pathnames of the files with hits from a Find in Files search.
I envision a right-click choice to do this, from the Search results window's context menu, possibly like so:

Executing such an option would place any pathnames present in the Search results window into the clipboard such that when they are later pasted, one pathname appears per line in the paste.
Of course, if files are "unnamed", they'd simply come across in the copy as, e.g. new 3.
Debug Information
Request based upon functionality current to Notepad++ 7.9.5