Group Policy error: is not in a valid format

Group Policy
6.5 and older
7.0-8.5
9.0-9.7
9.8
https://kb.netwrix.com/1385
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You may receive a Group Policy daily summary email with the error: The file “\DC01.corp.<MyDomain>.comsysvolcorp.<MyDomain>.comPolicies{31B2F340-016D-11D2-945F-00C04FB984F9}Machineregistry.pol” is not in a valid format. The file might be corrupt. Use Group Policy Object Editor to reconfigure the settings in this extension.


The group policy is corrupted or it is not in a valid format. If you open the Group Policy Management Console > highlight the group policy in summary and navigate to > settings tab, most likely it will return you an error message.
Settings


First of all you need to find out the affected policy. In the error message “\DC01.corp.<MyDomain>.comsysvolcorp.<MyDomain>.comPolicies{31B2F340-016D-11D2-945F-00C04FB984F9}Machineregistry.pol” is not in a valid format – 31B2F340-016D-11D2-945F-00C04FB984F9 is the GUID of the affected group policy. To find out the GUID of a group policy open GMPC > high-light a group policy and open Detains tab > Unique ID is the GUID of a GPO.

GUID GPO

There are 3 possible solutions:

1. If you receive an error in the GPMC > GPO Settings you may meed to restore it from a backup or create anew.

2. This error may also appear when you enable the “Certificate Services Client – Certificate Enrollment Policy” policy. Please refer to the following MS article regarding this issue – http://support.microsoft.com/kb/2028605

3. Restore default domain GPOs from backup. Logon to any domain controller > open command prompt and type: dcgpofix /target:contoso.com (replace contoso.com with your domain name)
For more information please refer to the following article – http://technet.microsoft.com/en-us/library/cc739095(v=ws.10).aspx
NOTE: This solution is intended for use only as a last-resort disaster-recovery tool. The customer settings will be reset.

4. If you have any Antivirus software installed on the affected domain controller please check the Virus scanning recommendations for Enterprise computers – http://www.netwrix.com/kb/1585

5. You may also omit the errors.
To do that please open the file omitproplist_gp.txt located in the installation folder of the product and put the following to the file  in a new line:
*The file * is not in a valid format and must be replaced.*

If you didn’t find a solution please refer to the following Microsoft article regarding this issue – http://support.microsoft.com/kb/814751

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