icemanmelb, the command line tool Silver Searcher
(windows port of Ag) can search for strings inside a lot of files quickly.
You can make a FARR alias that searches with Silver Searcher and displays the result in FARR.
Make a new alias. Put this in the regex box
and put this in the results box (edit the paths to match the folders on your computer)
ag.exe $$1 | showmemo . ;;; appcapappendmemo "C:\path\to\ag.exe" $$1 C:\path\to\dropboxfolder
This uses the memo view and clears the view for each new search.