I don't. Though there are many pieces of software -- image viewers like photoshop and the like that can read them, but they can't (AFAIK) output the full range of values to a non-proprietary file format that I can then use as the source for manipulating the data in code -- they are oriented to converting the pixel data to "photos" for display and viewing, which invariably involves interpolations -- noise reduction, sharpening, color balancing etc. -- which I don't want. I want the raw data.