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I’m sorry for causing confusion. The reason comes from the specifications of RPG Maker.
Monster images each exist as separate files, so each file name uses the name of the individual monster.
On the other hand, walking graphics and face images are sets of eight characters in a single file.
I also thought this could make it difficult to know which walking graphics correspond to which monsters, so as a workaround I decided to add the initial letter(s) of the corresponding monster names to the end of the file names.
For example, a file named “Ch_Monster06_CD” means:
“This file contains the monsters whose names start with C and D.”
A file like “Ch_Monster_d03_DG” means:
“This is a damage graphic that includes monsters from those starting with D through G.”
At the moment, this is the clue you can use when searching for the corresponding files.