What is a dff file and how do I open a dff file?
A file with the DFF extension contains a three-dimensional model saved in the RenderWare binary stream format. This extension is used by various CAD programs and 3D games, such as Grand Theft Auto 3. Files are organized into multiple sections describing the geometry and materials that compose the model.
Relevant dff file links:How to open dff file on Youtube
How to open dff file on Wikipedia
How to open dff file on Microsoft.com