🚀 go-pugleaf

Kay, I doubt very much that FM binary files will ever be searchable by an O/S, they're just too [weird|complex] (take your pick). I don't recall ever hearing about a 3rd party FM search tool that would operate from the O/S, either. 

I've used S&R (at http://www.funduc.com <http://www.funduc.com> ) for searching FM binaries, but I haven't ever determined whether the search is 100% accurate, e.g. whether it also finds content in markers or footers, or how it would work when the target text had special formatting applied or it was at the end of a line with a hyphenation point in the middle of a word.  

It certainly works OK for a quick and dirty search though. If I recall correctly the replace capability didn't seem to work but it's been a looooong time since I tried it so you may have better luck (but PLEASE test only if you have a backup copy stored safely away in case replace testing munges the file up!)