Opens the Group Policy Editor log that is stored under %SYSTEMROOT%\Debug\UserMode.
This file does not have much information useful to trouble shooting policies, only their editing.
Sample GPEdit output:
GPEDIT(650.6f0) 22:16:17:937 ExtractServerName: Failed to parse server name from ADSI path
GPEDIT(650.6f0) 22:16:17:947 GetDomainFromLDAPPath: Failed to set pathname with 0x80005000.
GPEDIT(650.6f0) 22:16:17:947 CGroupPolicyObject::OpenDSGPO: Failed to get domain name
GPEDIT(608.714) 22:20:12:349 CGroupPolicyObject::OpenDSGPO: C:\WINNT\System32\mmc.exe does not start with LDAP://
GPEDIT(2a8.62c) 23:01:17:803 ExtractServerName: Failed to parse server name from ADSI path
GPEDIT(2a8.62c) 23:01:17:963 GetDomainFromLDAPPath: Failed to retrieve leaf with 0x80005000.
GPEDIT(2a8.62c) 23:01:17:963 GetDomainFromLDAPPath: Failed to remove leaf with 0x80004005.
GPEDIT(2a8.62c) 23:01:22:991 QueryForDCName: Failed to query for a DC name with 1355
GPEDIT(2a8.62c) 23:01:22:991 GetDCName: Failed to find a domain controller
GPEDIT(2a8.62c) 23:01:22:991 CGroupPolicyObject::OpenDSGPO: Failed to get DC name with 1355
GPEDIT(464.75c) 23:05:16:402 ExtractServerName: Failed to parse server name from ADSI path
GPEDIT(464.75c) 23:05:16:412 GetDomainFromLDAPPath: Failed to retrieve leaf with 0x80005000.
GPEDIT(464.75c) 23:05:16:412 GetDomainFromLDAPPath: Failed to remove leaf with 0x80004005.
GPEDIT(464.75c) 23:05:21:309 QueryForDCName: Failed to query for a DC name with 1355
GPEDIT(464.75c) 23:05:21:309 GetDCName: Failed to find a domain controller
GPEDIT(464.75c) 23:05:21:309 CGroupPolicyObject::OpenDSGPO: Failed to get DC name with 1355
GPEDIT(33c.398) 23:05:34:998 ExtractServerName: Failed to parse server name from ADSI path
GPEDIT(33c.398) 23:05:35:008 GetDomainFromLDAPPath: Failed to retrieve leaf with 0x80005000.
GPEDIT(33c.398) 23:05:35:008 GetDomainFromLDAPPath: Failed to remove leaf with 0x80004005.
GPEDIT(33c.398) 23:05:35:008 QueryForDCName: Failed to query for a DC name with 1355
GPEDIT(33c.398) 23:05:35:008 GetDCName: Failed to find a domain controller
GPEDIT(33c.398) 23:05:35:008 CGroupPolicyObject::OpenDSGPO: Failed to get DC name with 1355
GPEDIT(2a8.734) 23:06:55:662 ExtractServerName: Failed to parse server name from ADSI path
GPEDIT(2a8.734) 23:06:55:672 GetDomainFromLDAPPath: Failed to retrieve leaf with 0x80005000.
GPEDIT(2a8.734) 23:06:55:672 GetDomainFromLDAPPath: Failed to remove leaf with 0x80004005.
GPEDIT(2a8.734) 23:07:00:599 QueryForDCName: Failed to query for a DC name with 1355
GPEDIT(2a8.734) 23:07:00:599 GetDCName: Failed to find a domain controller
GPEDIT(2a8.734) 23:07:00:599 CGroupPolicyObject::OpenDSGPO: Failed to get DC name with 1355
GPEDIT(710.70c) 23:07:31:974 ExtractServerName: Failed to parse server name from ADSI path
GPEDIT(710.70c) 23:07:31:984 GetDomainFromLDAPPath: Failed to retrieve leaf with 0x80005000.
GPEDIT(710.70c) 23:07:31:984 GetDomainFromLDAPPath: Failed to remove leaf with 0x80004005.
GPEDIT(710.70c) 23:07:31:984 QueryForDCName: Failed to query for a DC name with 1355
GPEDIT(710.70c) 23:07:31:984 GetDCName: Failed to find a domain controller
GPEDIT(710.70c) 23:07:31:984 CGroupPolicyObject::OpenDSGPO: Failed to get DC name with 1355
GPEDIT(68c.5bc) 23:29:21:491 ExtractServerName: Failed to parse server name from ADSI path
GPEDIT(68c.5bc) 23:29:21:651 GetDomainFromLDAPPath: Failed to set pathname with 0x80005000.
GPEDIT(68c.5bc) 23:29:21:651 CGroupPolicyObject::OpenDSGPO: Failed to get domain name
GPEDIT(564.754) 22:52:29:698 CGroupPolicyObject::OpenDSGPO: CheckDSWriteAccess failed with 0x80070005
GPEDIT(5c4.61c) 22:53:32:257 CGroupPolicyObject::OpenDSGPO: CheckDSWriteAccess failed with 0x80070005
GPEDIT(564.728) 23:07:02:816 CRegistryHive::Initialize: Failed to open registry key with 5
GPEDIT(564.728) 23:07:02:816 CGroupPolicyObject::OpenLocalMachineGPO: User registry failed to initialize