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In this list, OBJ, STL, C4D, and 3DS represent various file formats for 3D models. OBJ is a common format used in many 3D modeling software, while STL is widely accepted by 3D printers. C4D stands for Cinema 4D, which is a popular 3D animation and rendering software that saves files in its own proprietary format (C4D). Similarly, 3DS represents the file extension for files created using Autodesk's 3ds Max software. These formats enable seamless sharing and manipulation of 3D models across different platforms and applications.