Vista remove file association

How do I remove an extension file association in Vista (or for that matter Windows 7)

Under an account that has administration rights on your computer:

Above the start button, type 'cmd ' and hit return.

Now in the new window (which is known as the command window, type "assoc .mdf" (without the quotes) and hit return.

you will see the current association - as below in this case after an install of the otherwise excellent DAEMON tools lite.

To remove an association simply type: "assoc .mdf=" (without the quotes) and hit return.

To restore a previous association type: "assoc .mdf=SQLServer.Engine.PrimaryDataFile"

Hint: you may need another unchanged computer to check the exact text to type after the equals sign.

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