I downloaded a dll but cannot use it as it is considered untrusted. I opened it using: Notepad.exe filepath\filename:zone.identifier and it informed me that that the file was in zone 3.

Despite this I do not get an unblock button in the properties page for the file. Not being able to unblock it with this button I instead changed the value in notepad and saved my changes. When I reopen the zone.identifier info it is as I left it.

I have set it to both 2 (trusted) and 0 (no information), but still am unable to use the files.

Any one have any ideas?

If I cannot unblock the files I will investigate turning this blocking off, but as a first step I'd like to try and just unblock this one file.

Note: using Windows 7 Ultimate edition. It is when using MSTest from within Visual Studio 2008 that I hit problems.