Sorry, good catch, it is in fact c\Users\user_name\documents (although in typical Win10 fashion I had to start a dos prompt and do a dir as explorer claims it is "This PC> Documents" no user name in sight). It shouldn't however be in the C:\Fritzing directory. On my working Win10 install its in C:\Users\Peter\Documents\Fritzing\bins\search.fzb and
c:\Fritzing contains only fritzing.0.9.3b.64.pc as that is where I unzipped the downloaded file. Are you using explorer to look for the files? If so perhaps try it from a command prompt in case you are hitting the same issue that bit me with explorer simplfying the path for us dummies ... We may be in fact talking about the same directories. Also try starting Fritzing and under help click Enable debugging log, on mine that gets the single line
loading bin 'Search'
when the working search window comes up. I'd be interested in what yours says when the window doesn't come up. That may give us a clue as to what is going on. I'll edit my other post to add the username to the path.
Peter