I appreciate the heads-up, Andre. Yeah, I was kind of rushed this morning, I read quickly through this thread, tried all the download links except the one with "free" in the title. For some reason my head was telling me that "Sharefree" was not the registered version, but it was some sort of "freeware".
Well anyway, I just installed this and it is a frickin' Ferrari compared to CHMreader, a free program I'd downloaded a while back. It opened up a 3/4 meg file instantaneously, whereas the free program took about a minute. It also replicates the tree structure of chm help files which is great. Over time I've collected a lot of CHMs that I've been meaning to get around to, so this should be invaluable.