If you are modding on a mobile device, you can use specialized apps: CAD Assistant CAD Assistant app to open and view the OBJ file.

Converting an file to DFF (RenderWare) is a standard workflow for modding older games like Grand Theft Auto III, Vice City, and San Andreas . Since OBJ is a universal 3D format and DFF is a proprietary format, you must use specialized plugins or third-party software to bridge the gap. Method 1: Using Blender (Recommended)

If converting a character OBJ to a skinned DFF: