"Finding files that other search engines miss." That's Agent Ransack's claim to fame and it recently pulled my backside out of the fire when I needed to find some SQL in a Dynamic Link Library (DLL) file. Turned out the SQL was in Unicode format, making the usual perusal with Notepad useless, but with Agent Ransack, no problem. And like all good things, it's free (I love free) for both personal and commercial use.
Big shout out to Jon C for this freebie!