_source is the source code in case you'd like to change something in the game or continue development. :)
* Get cube_2004_05_22_pocketpc_bin_xscale_opengl_es.zip, unzip and copy it to a folder somewhere on your pda/memory card.
* Get cube_2004_05_22_pocketpc_bin_xscale_opengl_es_opti mized.zip and overwrite the .exe in the above folder.
I guess the best way would be to buy an x50v instead.
Seriously, I don't know. It's written almost 3 years ago, so you can count on it not being optimized for wm5. You'd have to google it.