Notes about the CMTD file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries, unused processes and other unfavourable system settings to identify slowdown issues.
The CMTD file type is primarily associated with 'Cool Moon To Do' by Cool Moon Software, LLC.. Cool Moon To Do is software that lets you create and maintain your To Do list. It is presently free.