The YCM file extension is related to the Yugioh Card Maker. The *.ycm file stores custom trading card.
YCM file extension - Yugioh Card Maker file
What is ycm file? How to open ycm files?
File type specification:
The YCM file extension is associated with the Yugioh Card Maker software.
Yugioh Card Maker file - custom trading card created with Yugioh Card Maker
Proprietary file format used by Super Simple Games software. Seems to be obsolete.