The Group Policy
The Group Policy is a Microsoft Windows feature which allows users, with administrator rights, to create and control a set of rules of the working environment for all users that have access to that specific computer.
How to Restrict File Types in a Group Policy Folder
With Group Policy, administrator can change certain settings to restrict file association. File association is essentially a policy which makes a specific application or software to run when a certain file extension is opened.
Be aware that this task requires administrative rights and a server computer.
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Log in to the server computer with administrative rights and privileges
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Click on the Start ► All Programs ► Administrative Tools.
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Launch the Group Policy Management Console.
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Locate the server object folder on which you wish to enforce the policy, right-click on it and choose the Edit.
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Click on the Computer Configuration.
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Click on the Preferences.
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Click Control Panel Settings and locate Folder Options, right-click on it and choose New from the context menu.
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Select File Type an click the Actions drop-down menu and choose the Create option.
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Click on the File Type Settings drop-down menu and select the File Extension option.
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Type in the file extension you wish to enforce and restrict, choose the program under Association and finally finish the task by clicking on OK.