How to unblock chm files - unblock button is missing

Posted by Yoav on Super User See other posts from Super User or by Yoav
Published on 2012-11-10T14:30:35Z Indexed on 2012/12/11 23:06 UTC
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windows-7

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security

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chm

I downloaded a CHM file. When I double click it it prompts me to open / save / cancel. Whether I open or save a new copy, the 'new' version will prompt the same open / save / cancel popup ad infinitum.
Searching google it seems that Microsoft have deemed it right for security reason to block these files by default. The solution is to right click the file, and click the 'unblock' button at the bottom:

enter image description here

The problem is that I don't have that button on my system:

BTW, the button is also missing for .exe files.
I'm using Win7 64bit. Any ideas?

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