I'm not the official creator, I just discovered this.

Place R4Menu folder on the root of your card.

It seems to load games and support cheats well, however I'm unsure if it loads music and videos.
It acts like a firmware replacement for the official R4 firmware.

If you want to use it as a firmware replacement, use _DS_MENU.DAT.
Otherwise for an executable homebrew app use R4Menu.nds




Well, that was a quick readme... as I said I'm not the creator of this.



--
Bekar
GBAtemp