Hi,
According to the screenshot, the schmmgmt.dll file you register is stored in C:\Windows\SysWOW64. The one you need to register is located in C:\Windows\System32.
Based on the current situation, please refer to C:\Windows\System32 to check if the file schmmgmt.dll exists. If not, please copy one to C:\Windows\System32
and run the command: regsvr32 schmmgmt.dll to register it.
After that, please try to add Active Directory Schema snap-in to MMC again.
Regards,
Arthur Li
TechNet Subscriber Support
in forum
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