Tech blog

A way to get around this is to disable another new security feature by typing in about:config into the address bar and add a new boolean key value called extensions.checkUpdateSecurity

Set the value to false and try to install the extension again.
Should work like a charm.

We have experienced problem how to add MimeType that has two extensions, such as .exe.config

You can not do this using IIS7 GUI manager.

Instead of this use IIS7 console programme:

"C:\Windows\System32\inetsrv\appcmd.exe" set config "Default Web Site/sicer08" -section:system.webServer/staticContent /+"[fileExtension='.exe.config',mimeType='application/octet-stream']"

One more problem we expirienced on Windows 2008 Server 64-bit is that you can not see configuration files. They should be in C:\Windows\System32\inetsrv\Config\ but you can not see them using Windows Explorer, 32-bit application on 64-bit system so you need to find and install Microsoft IIS Admin Tool in order to manage these files (you will get one new icon in IIS7 Management Studio when you click on you IIS webserver and its name is Configuration Editor – you can edit then in Notepad – oh no…).