Panasonic cameras create RAW files with the RAW or RW2 extension. RW2 is the latest.
Leica rebadged camera also generate RWL files that don’t seem to be different from RW2.
MIME Type
image/x-panasonic-raw and image/x-panasonic-rw2
Organisation
TIFF but with a different version in the magic:
IIU\x00\x08\x00\x00\x00. Also the tags are uncommon. The CFA is in the
mainIFD that also reference an Exif IFD.
Old RAW files don’t have a preview. Newer one (some RAW and all RW2) have a complete JPEG with Exif embedded.
The RAW data is compressed (proprietary). The CFA bayer layout is BGGR.