Camera Photo Files Extensions - What are cameraphoto files and how do I open a cameraphoto file?

What are cameraphoto files and how do I open a cameraphoto file?

File Type Category File Format
.cr2 Camera Photo Files Canon Raw Image File
.dcr Camera Photo Files Kodak RAW Image File
.eip Camera Photo Files Enhanced Image Package File
.fff Camera Photo Files Hasselblad RAW Image
.mos Camera Photo Files Leaf Camera RAW File
.nar Camera Photo Files Nokia Smart Cam File
.nef Camera Photo Files Nikon Electronic Format RAW Image
.sr2 Camera Photo Files Sony RAW Image