The PMX format is associated with MikuMikuDance Model File. It contains a 3D mesh for models, dancers, characters, and other accessories.
The quick and simple way to handle your files is to get a quality piece of software, such as reaConverter. This software is extremely efficient in managing a wide range of batch conversions. As you will soon realize, reaConverter will help you avoid spending countless hours trying to figure out how to convert multiple PMX files as once.
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