Here is the Dune IP Remote by RMX.
Supported hardware: any HDI DUNE Player that is based on the black remote control.
Supported firmware: any HDI DUNE firware that is equal to or later than "101203_2124_test". It will not work with firmwares released prior to December 2010.
To use just unzip the contents of the package to one folder on your network (local or remote storage, but better NOT to store it on the Dune itself), edit the main.html file and replace all instances of the DUNE_IP_ADDRESS to the actual address of your Dune and then open the Remote.html file in your browser. If all goes well you should have a textual representation of the remote and all buttons should work as they do on the IR remote.
The file is available here: Download v0.01