This is because you do not have permission to open it, or you are on a windows server workstations and that snap in has been disabled. This would appear on programs like group policy editor or disk defrag.
You need to open them as an administrator.
B. Local Users and Groups ~_~
B. Local Users and Groups ~_~
Active Directory Users and Computers is a snap-in. A snap-in cannot be started from a command line or from "Start" "run" it has to be started from an MMC (Microsoft Management Console). If you do not know how to create a Custom MMC let me know an I will walk you through those steps. you can use dsa.msc
To start customizing the Microsoft Management Console (MMC), first, open it by typing "mmc" in the Run dialog (Windows + R) or the Start menu. Once it's open, you can add snap-ins by going to the "File" menu and selecting "Add/Remove Snap-in." Choose the desired snap-ins from the list, configure them as needed, and then save your customized console layout for future use.
dsa.msc its a MMC snap in
to add functionality to standalone snap-ins
Tools executed from a command line have an .exe file extension and MMC Snap ins have .msc file extension
Tools executed from a command line have an .exe file extension and MMC Snap ins have .msc file extension.
Encryption is not required
False
"Microsoft Management Console" - Control Panel - Administrative Tools
Oh, dude, those are called snap-ins! They're like the cool little accessories you can add to your console to make it do extra stuff. You know, like adding a new app to your phone, but for your computer. So, yeah, snap-ins are there to help you customize and enhance your console experience.