Raw converters never write to the raw files. The raw files are from-camera originals, and shall remain so. Usually they are closed, not documneted standards, an in order not to corrupt them, raw-editors do not write them. They usually create a separate file, wich contains the alterations the user have made. And every raw-converter does it on its own way (even the tools the raw converters offer differ slightly). They even place theese files differently (some of them place them to the folder of the image files, while others make a separate directory), and none of them can read the sidecar files of the others (naturally ). If you have processed a photo with one type of converter, you won’t be able to view the result later on a different converter.
The only exception is DNG. DNG stores the original raw file + metadata about this file in a container. The metadata is about the alterations the user made (in a standardized form) and data on the photo (exif, iptc, xmp, and whatewer). And it is an open standard. Not a perfect one, but usable. And the applications, that implement the standard can read, interpret and write the DNG files (writing means altering the metada about the original embedded raw file, and not directly altering the embedded original raw file).
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