The file extension on a Nikon RAW file (.NEF) will be different from a Canon RAW file (.CR3), for example. But Adobe created an open-source digital negative format called DNG.

Hi--I've decided to convert all my CRW's and CR2's to DNG. For JPG's I use ExifRenamer to set filenames to the 14 digit date the image was digitized by my camera. I sort and archive all my images ...

Adobe has released version 2.3 of their Camera Raw Photoshop Plugin.The Canon 20D is not yet officially supported, but I believe the raw files are of the same format as the Canon 1D Mark II ...