
Just go to C:\Program Files\MAXON\Cinema 4D\resource\libs\win64 and copy the libmmd.dll as well as the svml_dispmd.dll from here into your C:\Windows\System32 folder. Fortunately this problem is common enough that these DLL files come packaged with your installation of Cinema 4D just in case you need to replace them.

You're actually missing two DLL files: libmmd.dll and svml_dispmd.dll sometimes these files are lost by Windows for a multitude of reasons.If the file isn't saved correctly from the system or has been modified by another program it could cause problems. Usually this files are installed automatically with Cinema 4D. It's needed for some special functions inside the programs.

Libmmd.dll is a dll file needed for Cinema 4D firstly and some other programs on your machine.
