MMC cannot open the file ...

From time to time you may see an error message similar to this when trying to open any MMC snap-in:


Microsoft has this article about it. The solution suggested did not seem to work for me.

I was able to get around this problem by opening mmc (it's located within the scope of the path variable so you can just go "Run -> mmc" to open it). You can then add the approriate snap in.