I'm not saying renaming a file will change the way programs behaves. (actually you can create a program that checks for its name and change its behavior based on that).I'm saying I was having the same problem as described, in my case running Windows ...

Just make sure when download the RTMT Pluging your browser is not renaming the file like:CcmServRtmtPlugin(1).exe The "()" is the one causing the problem. Good luck