If you own a Nintendo DS with some sort of flash cart (eg. R4DS, Supercard, M3 etc), you can almost certainly run a homebrew multimedia program named Moonshell. Moonshell is able to play videos, but they must be in .dpg format. While many solutions for converting other formats to .dpg exist in Windows, there have been remarkably few efforts to create a similar program for Mac OSX. This guide outlines the best and easiest method to use on Mac OSX.