Files remain encrypted after you copy the files from an encrypted folder to a WebDAV share if the files are copied by using a computer that is running Windows 7 or Windows Server 2008 R2

Applies to: Windows Server 2008 R2Windows 7

Symptoms


On a client computer that is running Windows 7 or Windows Server 2008 R2, you have a folder that is encrypted by using Encrypting File System (EFS). You upload the files in the encrypted folder to a Web Distributed Authoring and Versioning (WebDAV) share folder. The files that are uploaded to the WebDAV share folder remain encrypted.

In this situation, you may want the encrypted files to be decrypted during the file copy operation so that other users have access to the files. However, you cannot find a method to disable EFS encryption during the WebDAV file copy operation.  For example, you cannot view the EFS encrypted files from the Explorer view in Microsoft Office SharePoint Server (MOSS). Therefore, you want the files to be decrypted.

This article helps you fix this problem.

Cause


This issue occurs because encryption information is maintained for secure file copy and storage operations. 

Resolution


A hotfix is available to resolve this issue. To apply this hotfix, you have to change the registry. For more information, see the "Registry Information" section.

After you apply this hotfix, the following changes are made: 
  • When you copy an encrypted file to a WebDAV share folder that is not encrypted, the encryption on the file is removed. Additionally, you receive a warning message and an option to cancel the file copy operation. 
  • The Advanced tab on the Properties page of a file or folder in a WebDAV share folder is hidden. Therefore, you cannot encrypt the file or folder. 

    Note This change only applies to WebDAV share locations
  • When you copy an encrypted file to an encrypted folder that is located on the WebDAV share folder, the file remains encrypted. Additionally, the encryption remains when you overwrite an existing encrypted file on the WebDAV share folder.

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

To apply this hotfix, you must be running Windows 7 or Windows Server 2008 R2.

Registry information

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows


To apply this hotfix, follow these steps: 
  1. Click Start, type Regedit.exe in the Search Programs and files field, and then press ENTER.
  2. Locate and then click the following registry subkey:
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\MRxDAV\Parameters
  3. On the Edit menu, point to New, and then click DWORD Value.
  4. Type DisableEFSOnWebDav to name the entry, and then press ENTER.
  5. On the Edit menu, click Modify, type 1, and then click OK.
  6. Exit Registry Editor.

Restart requirement

You have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.
Windows 7 and Windows Server 2008 R2 file information notes
Important Windows 7 hotfixes and Windows Server 2008 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 7/Windows Server 2008 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.
  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 R2 and for Windows 7" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintain the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.
For all supported x86-based versions of Windows 7
File nameFile versionFile sizeDateTimePlatform
Mrxdav.sys6.1.7600.20787116,22421-Aug-201004:46x86
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
File nameFile versionFile sizeDateTimePlatform
Mrxdav.sys6.1.7600.20787141,31221-Aug-201004:56x64
Mrxdav.sys6.1.7600.20787116,22421-Aug-201004:46x86

Status


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

More Information


For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

Additional file information

Additional file information for Windows 7 and for Windows Server 2008 R2

Additional files for all supported x86-based versions of Windows 7
File nameX86_1ca34030a3400980284a55f7feb697f5_31bf3856ad364e35_6.1.7600.20787_none_71d51030ac890459.manifest
File versionNot Applicable
File size706
Date (UTC)21-Aug-2010
Time (UTC)09:50
PlatformNot Applicable
File nameX86_microsoft-windows-webdavredir-mrxdav_31bf3856ad364e35_6.1.7600.20787_none_150cde6c402b03f8.manifest
File versionNot Applicable
File size12,632
Date (UTC)21-Aug-2010
Time (UTC)07:17
PlatformNot Applicable
Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
File nameAmd64_11b31b5a1d713163cfb02e61405b4f7f_31bf3856ad364e35_6.1.7600.20787_none_62b9f4da8e9554f6.manifest
File versionNot Applicable
File size710
Date (UTC)21-Aug-2010
Time (UTC)09:50
PlatformNot Applicable
File nameAmd64_ae98eb900c47fa41dfda4e2f61b2df34_31bf3856ad364e35_6.1.7600.20787_none_da10c7f4965af278.manifest
File versionNot Applicable
File size710
Date (UTC)21-Aug-2010
Time (UTC)09:50
PlatformNot Applicable
File nameAmd64_microsoft-windows-webdavredir-mrxdav_31bf3856ad364e35_6.1.7600.20787_none_712b79eff888752e.manifest
File versionNot Applicable
File size12,634
Date (UTC)21-Aug-2010
Time (UTC)08:18
PlatformNot Applicable
File nameWow64_microsoft-windows-webdavredir-mrxdav_31bf3856ad364e35_6.1.7600.20787_none_7b8024422ce93729.manifest
File versionNot Applicable
File size6,779
Date (UTC)21-Aug-2010
Time (UTC)07:14
PlatformNot Applicable