When I right click and then click Properties, the box just goes away and nothing comes up. I have a .chm file that won't open in Win10, Research shows I should click unblock in properties to get it to work. I can't get to properties to do this. I am using Windows 10 Pro 64 bit. I have tried to access the properties on .chm, .doc and .pdf files. I searched but didn't find any other reported incidents like this. Any ideas are appreciated.