You may receive an incorrect "Previous Versions" list and be unable to restore snapshots from the "Previous Versions" dialog box on a computer that is running Windows 7 if the file server is running Windows Server 2003

Consider the following scenario:

• You have a computer that is running Windows 7.
• You try to list "Previous Versions" for a Windows Server 2003-based share.

In this scenario, you may receive an incorrect list of earlier versions, and Restore is unavailable in the dialog box. Additionally, when you try to open an earlier version that is listed, the Open with dialog box may appear. This issue prevents you from performing a restore to an earlier version.

This problem occurs because the Downlevel Timewarp feature is enabled on the file servers. This feature incorrectly returns a "valid directory" response for some incorrectly formatted directory requests.

Note The Downlevel Timewarp feature was developed to support a client that is running Windows 95 or Windows 98.

By default, the registry key is not enabled. However, it is enabled in Windows Small Business Server 2003. Users who have implemented this registry key or who use Small Business Server 2003 together with "Previous Versions" functionality for file shares may be affected.

The registry key can be found at the following location:

To resolve this problem, perform the following operation on the file server that is causing the issue. Back up your registry files, and then change the value of the DisableDownLevelTimewarp key to 00000001.

The registry key can be found at the following location:

Note This registry change does not require a server restart.

After you change the registry value, verify that you can correctly view and restore a snapshot of an earlier version by using the computer that is running Windows 7.