Background
Ever since I upgraded to Vista years ago and possibly before on XP, I’ve had problems with CHM help files I’ve downloaded. Normally I get frustrated that I can’t open yet another help file and find the information elsewhere.
Problem Solved
Today I downloaded a help file that I really needed to be able to use (Graph# to be precise); there isn’t a lot of information available on the Internet about Graph#, so I had no choice but to crack this problem for myself.
Turns out its a simple solution. Go to the properties of the chm file and if you trust the source simply Unblock. So simple it’s a little embarrassing.