MCD (Monu-CAD Drawing) is one of the file formats used by the Monu-CAD monument/headstone design program along with MCC, MCP, and MTN, as well as FNT (fonts), which are stored in the same format as MCD. There are Lite! and Pro versions of the software.
MCC is the format of drawings. Fonts are also stored in this format, with a .fnt extension.
Monu-Cad Lite! Ver. 1.00.083 and earlier don't support loading MCC and MCD files created with MonuCad Pro 7.09. A later Lite! release supports imports from all of versions 5, 6, and 7 of the Pro version.