What is .PMX file extension?
3D model used by MikuMikuDance (MMD), a dance animation program originally created in Japanese; contains a 3D mesh for models, dancers, characters, and other accessories that can be texturized and animated with the MikuMikuDance tools; used for storing different dancer models.
PMX files have morphs that can alter different aspects of a model's appearance, such as the color of components, positioning of model bones, and model transparencies. The morphs in PMX file are more advanced than those in .PMD files. PMX files are located in the "Models" folder.
You can see a list of software programs here on www.easyfileopener.org that can open this file type so that you don’t need to search for it on the web. You can then open your file with this extension using a software listed below.