Hi, the files within the mod are named after the IDs of one of Momiji's costumes (01841/01842) so the mod should apply when using Momiji with that specific costume. You'd have to change the filenames to replace Ryu files e.g. for default Ryu 00823.dat and 00824.dat I believe. I don't know how well that will work, but you can give that a go if you want to use the mod over Ryu :)
Refer to this for costume IDs if you want to play around with costume replacements:
I haven't found all of them for Ninja Gaiden 3 yet but I've found these: 00705 Ryu - Legendary Black Falcon 00780 Ayane - Nocturnal Butterfly 00822 Kasumi - Night Sakura
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i change tmc tmcl file to .dat and put them in the mod loader but it seem not work
Refer to this for costume IDs if you want to play around with costume replacements:
00705 Ryu - Legendary Black Falcon
00780 Ayane - Nocturnal Butterfly
00822 Kasumi - Night Sakura