Block specific import converters based on class ID (CLSID)

This policy governs which import converters based on class ID (CLSID) should be blocked.

If you enable this policy setting, you will be able to list the CLSID's of converters that will be blocked. Enter the CLSID for Value Name. For Value, enter 1 to block this converter. Entering a 0 will not block the converter.

If you disable or do not configure this policy setting, no specific converters will be blocked.

NOTE: If you enable this policy and enter the converter CLSID's and then click to disable or not configure this policy, the list of converters under Value Name will be lost.

Supported on: At least Windows Vista

List of converters based on class ID (CLSID) and whether the converters are blocked

Registry PathSoftware\Policies\Microsoft\Office\12.0\Excel\Security\FileOpenBlock\OOXML Converters
Value Name{number}
Value TypeREG_SZ
Default Value


Administrative Templates (Computers)

Administrative Templates (Users)