How do I edit cmesh files

Seeing as nobody seems to want to help me and remove the katana from the GoTR Ronin Jacket, I decided I'd do it myself. But I've come to an error and don't know how to edit the cmcoa_mronin01_v.cmesh_pc, cmcoa_mronin01_o.cmesh_pc and the cmcoa_mronin01_c.cmesh_pc files. Can somebody please help me for once.
 
The reason people didn't help you is probably that they don't know how to edit it either rather than not wanting to help.
 
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