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  2. Sparse bit is not always being set when restoring encrypted files using EFS raw APIs

Sparse bit is not always being set when restoring encrypted files using EFS raw APIs

Symptoms

You use WriteEncryptedFileRaw to restore encrypted files on Windows Vista or Windows Server 2008. After the restore of an encrypted sparse file the FILE_ATTRIBUTE_SPARSE_FILE is missing.

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Cause

This is a bug in WriteEncryptedFileRaw API.

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Workaround

After restoring an encrypted file, use fsutil.exe to set the parse bit back on it.

fsutil.exe sparse setflag <full path name to file>

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More Information

Details regarding fsutil can be found at : http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/fsutil.mspx?mfr=true
Location of fsutil is: %windir%\system32

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Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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Keywords: kb

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Article Info
Article ID : 2574726
Revision : 1
Created on : 1/7/2017
Published on : 7/5/2011
Exists online : False
Views : 92