Panasonic cameras create RAW files with the RAW or RW2 extension. RW2 is the latest.
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.