Premiere Pro can import and output a wide variety of different video, still image and audio formats. With the assistance of third party plug-ins, many of which are automatically installed with the application the number of supported file formats is enhanced. Premiere Pro can only import the listed file types when the codec used with the file is installed locally on your computer. So in order to view or edit a file that has been encoded in the DivX codec, that very same DivX codec must be installed on your machine.
This list is taken from the Adobe Premiere Pro help files. A full and up-to-date list can be found at: http://helpx.adobe.com/premiere-pro/using/transferring-importing-files.html.
Please note that Adobe Premiere Pro can only import still image files that use the RGB and Grayscale color modes.