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What is .pmx?

Name: MikuMikuDance Model File
Extension: .pmx
Category: 3D
Developer: SME (Sony Music Entertainment)
Description: PMX is a 3D model file format for the MikuMikuDance (MMD) animation software. It is used to store 3D mesh data, bone data, and other information necessary to animate and render 3D models in the MMD application. The PMX format is a binary file which can be either exported from or imported into MMD.
MIME Type: application/x-pmx
Wikipedia: .pmx on Wikipedia