Windows – Change Windows 7 file permissions from command prompt

Have you tried taking ownership over the file. Instructions for hand right click menu here.

Use the User Environment variables.

Right Click Computer --> Properties --> Advanced Settings --> Advanced --> Environment Variables

In the User variables box click "New..".

Name the variable "Prompt" (without quotes), and set it's value to what you want the prompt to be (refer to "prompt /?" at a command line).

OK --> OK

Open a command prompt (cmd) and it should use that prompt.

Tested in Windows 7, and it still works like it did in NT 4 :)

Hope that helps...