If you've installed the Microsoft root certificate, you can check the
signature of the file... this will verify that the file is from Microsoft,
and that it has not been altered since originally signed. To check this,
right-click on the file, select "properties," "digital signature," and click
on "details." And sit back... 'cause it may take a while (as long as 10-20
minutes, depending on CPU speed, available memory, etc.) to verify that the
signature is valid.
If the signature is valid, then the file is good.
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