This article was previously published under Q153105
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You cannot prevent users from viewing all files or extensions of knownfile types.
There is no system policy in Windows NT to allow this.
To resolve this problem, obtain the latest service pack for Windows NT 4.0 or Windows NT Server 4.0, Terminal Server Edition. For additional information, click the following article number to view the article in theMicrosoft Knowledge Base:
152734 How to Obtain the Latest Windows NT 4.0 Service Pack
Microsoft has confirmed that this is a problem in Windows NT 4.0 and Windows NT Server 4.0, Terminal Server Edition. This problem was first corrected in Windows NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack 4.
The new System Policy is named "Remove View->Options menu from Explorer"in the category Windows NT Shell\Restrictions for Users and Groups.