Files with the AC3D extension are created using a 3D modelling software program with the same name, currently developed by Inivis. AC3D functions mostly as a tool for creating graphics for games and simulations. AC3D, AC and ACC are proprietary formats of the AC3D software.
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 AC3D files as once.
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