Explanation/Reference:
Explanation:
Install the Active Directory Schema Snap-In
You can use this procedure to first register the dynamic-link library (DLL) that is required for the Active Directory Schema snap-in. You can then add the snap-in to Microsoft Management Console (MMC).
To install the Active Directory Schema snap-in:
To open an elevated command prompt, click Start, type command prompt and then right-click

Command Prompt when it appears in the Start menu. Next, click Run as administrator and then click OK.
To open an elevated command prompt in Windows Server 2012 R2, click Start, type cmd, right-click cmd and then click Run as administrator.
Type the following command, and then press ENTER:

regsvr32 schmmgmt.dll
Click Start, click Run, type mmc and then click OK.

On the File menu, click Add/Remove Snap-in.

Under Available snap-ins, click Active Directory Schema, click Add and then click OK.

To save this console, on the File menu, click Save.

In the Save As dialog box, do one of the following:

To place the snap-in in the Administrative Tools folder, in File name, type a name for the snap-in, and

then click Save.
To save the snap-in to a location other than the Administrative Tools folder, in Save in, navigate to a

location for the snap-in. In File name, type a name for the snap-in, and then click Save.