Shot in RAW on a Panasonic LUMIX and stuck with .RW2 files? Windows does not read RW2 out of the box, so you need an old camera codec or an upload. RW2 is Panasonic's proprietary RAW format, a TIFF-based container holding 12-bit or 14-bit sensor data. A single frame is often over 20 MB. This RW2 to JPG Converter Software opens RW2 and writes a normal JPG you can open and share anywhere.