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Compressed files that are larger than 4 KB may be corrupted when you create or update the files
Article ID: 925308 - View products that this article applies to.
After you install security update 920958 (MS06-049) on a computer that uses NTFS file system compression, compressed files that are larger than 4 kilobytes (KB) may be corrupted when you create or update the files.
This problem occurs because of a regression error in security update 920958 (MS06-049), dated August 8, 2006.
To resolve this problem, install security update 920958 (MS06-049). This new security update was released on September 26, 2006, and it addresses the problem that is described in the "Symptoms" section.
Update informationThe following information applies to security update 925308. Security update 925308 has been replaced by security update 920958.
Note This update does not recover files that are already corrupted. If you created a backup before you installed security update 920958, you can recover the corrputed files from this backup.
To work around this problem, disable NTFS compression. This prevents future file corruption if you cannot install the security update that is discussed in security bulletin MS06-049
(http://www.microsoft.com/technet/security/Bulletin/MS06-049.mspx). To disable NTFS compression for a folder, follow these steps:
compact /u c:\testUse the following command to disable NTFS compression for the C:\Test folder and for all subfolders. Also use this command to uncompress compressed files in the folder and in all subfolders:
compact /u /s c:\testFor more information about how to use command-line switches together with the compact command, type the following at a command prompt:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Security bulletin MS06-049 has been updated to mention a revised update that includes hotfix 925308.
For more information about security update 920958, visit the following Microsoft Web site:
Article ID: 925308 - Last Review: October 12, 2006 - Revision: 3.3