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Thanks for the help. This works well 
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How do I prevent users on a domain from executing certain file types EG .AVI, .WMA, I have a Windows 2003 server and all clients running XP. Can this be done using Group Policy
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How do I prevent users on a domain from executing certain file types EG .AVI, .WMA, I have a Windows 2003 server and all clients running XP. Can this be done using Group Policy

How to block certain file extensions executing

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).

Windows Server 2003

The Microsoft Legacy Operating System topic includes legacy versions of Microsoft operating systems prior to Windows 2000: All versions of MS-DOS and other versions developed for specific manufacturers and Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions, and Windows Mobile.

Microsoft Legacy OS

This topic area includes legacy versions of Windows prior to Windows 2000: Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions including Windows Mobile.