Hi Didier, welcome to the forum.
The way I am thinking of using Qimage is to directly open the RAW images, do some necessary adjustments and print.
That is what I do with Canon CR2 files
my question 1: is can I be guaranteed that the raw is NEVER altered in any way, shape or form.
Absolutely guaranteed, Qimage stores the raw adjustments in a separate *.qrs file in the same folder as the image file.
Question 2: I own a Nikon D1X which I love, but this little ****!! seems to have a very special way of handling it's raw files, it can be a 6MP or 10MP file depending on how the raw is developed. Some raw converters default to 6MP, some to 10MP and some give the option and the result is not the same, at all. In order to test this, is there a demo version which allows to open RAW files ?
I'm afraid there is not a demo version of the Studio edition with raw processing. I don't know if Mike Chaney will see this and answer for you but the alternative would be to e-mail me a file and I'll tell you what happens.
If this is something you would like to do, say so here and I'll send you forum message with my e-mail address.
Did you see there is a guide to raw processing with Qimage?
http://ddisoftware.com/tech/qimage/qimage-raw-processing-a-guide/msg170/#msg170Terry