Pretty sure this is an animation format.
Mesh for Mythra:
https://cdn.discordapp.com/attachments/419711036837330956/525624432551526400/Blade201.FBX
Should be rigged. May have issues in Blender.
Extracted .MOT for her. Includes ANM files and one ASM file.
https://cdn.discordapp.com/attachments/419711036837330956/525624896970293248/ANM_Samples.zip
Ideally it would be nice to convert the animations to something like SMD or FBX.