I have tried most of the programs named in the two links above, but they don't recognize the files, something must be wrong, i just don't know what.
You should enable the
CHDK DNG support, then your cam will produce ready-to-use DNG RAW files:
-> guidance (if the .DNG filename extension is enabled, you probably can't transfer the files with the USB connection, use a card reader to transfer the .DNG files).
Most apps can't (yet) work with the 12bit CHDK RAW's directly; to open/convert this RAW files you need a software which supports them, e.g.
DCRAW since version 8.94.
So you can convert the CRW's / CR2's to the PPM format with DCRAW, most apps like PS, XNView etc. supports the PPM format.
If you're working with MS Windows, you'll find compiled binaries here:
http://www.insflug.org/raw/Downloads/The latest
UFRaw version 0.15 don't support the new RAWs since it is based on DCRAW 8.89 - but i guess within some weeks there will be a new UFRaw version available, then we could open the new CRW's directly in GIMP with an updated UFRaw plugin...
