You Receive The Error MMC Cannot Open the File C:\Winnt\system32\eventvwr.msc
1) Go to Start>Run>Type CMD and hit OK
2) Type regsvr32 C:\Windowssystem32\msxml3.dll and then hit enter.
This will solve your issue.
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In fact, any Windows Server admin snapin tools will not open and have a similar error, like Active Directory.
The issues occurs when the DLL msxml3. becomes unregistered. See the fix below.