The Active Directory schema snap-in is used to manage the Active Directory schema. For example, to modify the existing schema attributes and classes. By default, the Active Directory schema snap-in is disabled in Microsoft Management Console (MMC). Use this procedure to enable the Active Directory schema snap-in.
This procedure is applicable for Active Directory only.
Procedure
Log in to the machine where Active Directory is deployed as an administrator.
Open the command prompt.
Run the regsvr32 schmmgmt.dll command to register schmmgmt.dll on your system.
Click Start.
Click Run.
Run the mmc /a command.
In the Console window, click File > Add or Remove Snap-in
In the Add or Remove Snap-in window, under Available snap-ins, select the Active Directory Schema and click Add.
Click OK to add the schema to your console.
In the Console window, click File > Save to save this console.
