Tonight i played a little with the CHDK MoreBest (Juciphox) Build on my S5. I enabled the "Save DNG" option under the raw parameters menu and the "dng visible via usb" under the miscellaneous stuff menu. To my surprise i succeeded converting those file with the adobe dng converter straight after downloading them on my powerbook g4 running Mac os 10.5.6. Since i use Apple Aperture, i imported the photos in my library with no problem.
When i converted the file on the Adobe Utility i setted the preferences using these parameters 1) No compression 2) Preserve Raw Image 3) Don't convert to linear image 4) Don't embed original raw file
Hope it can help somebody out there