CR2 file format is supported by the canon cameras. It is a raw file format. Canon is a renowned brand of digital camera. The brand is appreciated by both professionals and the novices. Canon takes up beautiful pictures and appropriate for the different purposes as the projects. The picture format of cannon camera is different from the other brands of digital camera.
The camera uses CR2 or CRW as the file format. The basic functionality of RAW image file format is that it keeps the information in the text mode and keeps in the camera the time when the photo was captured.
For the canon users it may happen any point of time when the user accidentally deletes the CR2 files. Other than the accidentally deletion there are other instances too that may result in the corruption of CR2 files as the viruses invasion, application crash mishandling of memory card. Take for instance you pulled out memory card while processing.
The scenario must be quite pathetic. Whatever the reason is but the ultimate result is photo loss. You need to restore the photos back. If you are with the valid backup then you can easily restore from there other wise use third party software for the camera data recovery.