NeoN64Menu v2.4b1 is released. Myth-Menu is the menu the console will show when you boot the Neo Myth flash cart. Code for the MD, N64, PC-E and SNES menus has been committed. NeoN64Menu is N64 Myth Menu. Also includes the current Neon64 emulator and docs.

NeoN64Menu v2.4b1 Changelog:
added the ability to run NES games. When you select an NES game from the SD browser, the menu will try to load the NES emulator, Neon64. It is included with the archive and should be copied to the N64 menu directory on the SD card. The full path used is "/menu/n64/neon64/neon64cd.rom". The menu will load the emulator, append the selected game, recalculate the checksum, and run the emulator. The emulator title screen will appear - press any button to start the NES game. Read the readme in the neon64 directory for details on the emulator.

Download: NeoN64Menu v2.4b1
Download: NeoN64Menu v2.4b1 PAL
Source: Here