The Reg.exe utility does not compress a registry key when the utility saves a registry key to a hive file

Applies to: Windows Vista BusinessWindows Vista Business 64-bit EditionWindows Vista Enterprise More

Symptoms


Consider the following scenario:
  • You try to make copies of the registry or of the registry keys on a computer that is running one of the following operating systems:
    • Windows Vista
    • Windows Server 2008
    • Windows 7
    • Windows Server 2008 R2
    • Windows 8
    • Windows Server 2012
  • You use the reg save command to export the registry key into a hive file.
In this scenario, the reg save command does not compress the registry key during the exporting process. Therefore, the size of the hive file may be larger than expected.

Resolution


A hotfix is available to resolve this issue. After you install this hotfix, you can use the /c switch in the reg save command to compress the registry key. For example, the following command compresses the HKLM\System subkey:
reg save hklm\system %windir%\system32\config\system.lkg /y /c

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, your computer must be running one of the following operating systems:
  • Windows Vista Service Pack 1 (SP1)
  • Windows Vista Service Pack 2 (SP2)
  • Windows Server 2008
  • Windows Server 2008 Service Pack 2 (SP2)
  • Windows 7 Service Pack 1 (SP1)
  • Windows Server 2008 R2 Service Pack 1 (SP1)
  • Windows 8
  • Windows Server 2012
For more information about how to obtain a Windows Vista service pack, click the following article number to view the article in the Microsoft Knowledge Base:

935791 How to obtain the latest Windows Vista service pack

For more information about how to obtain a Windows Server 2008 service pack, click the following article number to view the article in the Microsoft Knowledge Base:

968849 How to obtain the latest service pack for Windows Server 2008

For more information about how to obtain a Windows 7 or a Windows Server 2008 R2 service pack, click the following article number to view the article in the Microsoft Knowledge Base:

976932 Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2

Restart requirement

You do not have to restart the computer after you apply this hotfix.

Registry information

You do not have to make any change to the registry.

Workaround


To work around the issue, you can manually export a registry key into a hive file by using the Registry Editor (Regedit.exe) utility. The Registry Editor (Regedit.exe) utility exports a compressed registry key into a hive file.

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, 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