I'm running WinXP x64 ed. and I cannot open .chm files on my system. I read that one could fix this issue either by unchecking the "Always ask" field of the security dialogue that pops up everytime a .chm file is opened or by clicking "unblock" in the properties of the .chm file.
The problem is that I don't have the "Always Ask" in the security dialogue and there is no Unblock button in the properties window. No registry modifications have helped me either. What do I do?