MOD is a format containing MPEG-2 video and AC3 audio. The extension is rarely used, that is why it can be opened only with special programs. Also MOD files can be playback by DVD players. If you want to open it with a standard player, the easiest way is to convert the file to MPG. Usually the format is used by Panasonic and JVC for recording video, the data is saved to a hard disk or SD card.

PRC (Product Representation Compact) is a 3D file format that can be used to embed 3D data in a PDF file. This highly compressed format facilitates the storage of different representations of a 3D model. For example, you can save only a visual representation that consists of polygons (a tessellation), or you can save the model's exact geometry (B-rep data). Varying levels of compression can be applied to the 3D CAD data when it is converted to the PRC format using Adobe Acrobat 3D.