These extra information's that are contained in CR2, make this Canon Raw images popular and favored in astrophotography because in post processing can be bought very fine details of planets, nebulae and galaxies. Also CR2 (or RAW files generally) offer great flexibility if you are dealing with exposure times. To under exposed images can easily be increased in brightness - contrast without introducing noise or effecting the dynamic range, as can a over exposed image.
Canon Raw Digital Image Viewer, or shortly, CR2 viewer is a free product that can easily open, convert, resize and save CR2 image files. Exporting is available in JPEG, PNG, GIF, TIFF and others file images extensions, providing maximum quality of exported images.
CR2 viewer, dispite converting CR2 extension in other file formats, also provide and rotating of the opened image and resizing. Enlarging or reducing of the images with CR2 viewer is done without losing much quality of opened image.
With other words, CR2 viewer is a nice tool for managing your Canon Raw images.