Install Wine with Linux Package Manager and Download Adobe DNG Converter for Windows.
Install it with Wine:
WINEPREFIX="$HOME/wine-dng" wine ~/Downloads/DNGConverter_version.exe
Do a testrun:
WINEPREFIX="$HOME/wine-dng" wine "$HOME/wine-dng/drive_c/Program Files/Adobe/Adobe DNG Converter/Adobe DNG Converter.exe"
Make life easier with a shortcut:
echo "alias dng='WINEPREFIX=\"\$HOME/wine-dng\" wine \"\$HOME/wine-dng/drive_c/Program Files/Adobe/Adobe DNG Converter/Adobe DNG Converter.exe\"'" >> ~/.bashrc && exec bash
If DNG Converter crashes on testrun ... fix it:
WINEPREFIX="$HOME/wine-dng" winecfg
Go to the "Libraries" tab, add a new override for api-ms-win-core-winrt-error-l1-1-0, then edit it and select "Disable".