The CRW format was supported by some earlier Canon digital cameras:3
Besides Canon's ZoomBrowser and Digital Photo Professional, several other software programs provide read support, and sometimes write support, for CRW files including:
Phil Harvey (September 6, 2010). "CanonRaw Tags". ExifTool. Archived from the original on 2 October 2011. Retrieved 18 October 2011. http://owl.phy.queensu.ca/~phil/exiftool/TagNames/CanonRaw.html ↩
"CIFF Specification on Image Data File Version : 1.0 revision 4" Archived 2008-12-30 at the Wayback Machine. Canon Inc. (via Xyrion.org). December 24, 1997. Retrieved 2013-05-06. http://xyrion.org/ciff/CIFFspecV1R04.pdf ↩
"Inside the Canon RAW format version 2, understanding .CR2 file format and files produced by Canon EOS Digital Camera". Lclevy.free.fr. Archived from the original on 2017-12-04. Retrieved 2013-05-06. http://lclevy.free.fr/cr2/#intro ↩