When including images in assets.muxzip for a theme it is a good idea to use Catalogue names when naming the png files. This will allow your theme to work on users devices regardless of their folder names and will help decrease support issues for us. Feel free to include alternate images that users can switch to.
Goose Names
Amstrad
Arcade
Arduboy
Atari 2600
Atari 5200
Atari 7800
Atari 800
Atari Jaguar
Atari Lynx
Atari ST-STE-TT-Falcon
Bandai WonderSwan Color
Book Reader
Cave Story
ChaiLove
CHIP-8
ColecoVision
Commodore Amiga
Commodore C128
Commodore C64
Commodore CBM-II
Commodore PET
Commodore VIC-20
Discrete Integrated Circuit Emulator
Doom
Dragon and Tandy
External Ports
Fairchild Channel F
Galaksija Retro Computer
GCE Vectrex
Handheld Electronic - Game and Watch
Java J2ME
Karaoke
LowRes NX
Lua Engine
Magnavox Odyssey - VideoPac
Mattel Intellivision
Media Player
Mega Duck - Cougar Boy
Microsoft MSX
NEC PC Engine
NEC PC Engine CD
NEC PC Engine SuperGrafx
NEC PC-8000 - PC-8800 Series
NEC PC-FX
NEC PC98
Nintendo DS
Nintendo Famicom Disk System
Nintendo Game Boy
Nintendo Game Boy Advance
Nintendo Game Boy Color
Nintendo N64
Nintendo NES - Famicom
Nintendo Pokemon Mini
Nintendo SNES - SFC
Nintendo Virtual Boy
Onscripter
OpenBOR
PC DOS
Philips CDi
PICO-8
Pyxel
Quake
Quake II
RPG Maker 2000 - 2003
ScummVM
Sega 32X
Sega Atomiswave Naomi
Sega Dreamcast
Sega Game Gear
Sega Master System
Sega Mega CD - Sega CD
Sega Mega Drive - Genesis
Sega Pico
Sega Saturn
Sega SG-1000
Sharp X1
Sharp X68000
Sinclair ZX 81
Sinclair ZX Spectrum
SNK Neo Geo
SNK Neo Geo CD
SNK Neo Geo Pocket - Color
Sony PlayStation
Sony PlayStation Portable
SVI-ColecoVision-SG1000
Texas Instruments TI-83
The 3DO Company - 3DO
TIC-80
Uzebox
VeMUlator
Vircon32
WASM-4
Watara Supervision
Wolfenstein 3D
There are some name changes from Pixie to Goose if you want to include both versions
Pixie Names
Bandai WonderSwan-Color
Books
External - Ports
Media
DOS
Microsoft - MSX
Nintendo FDS
Nintendo NES-Famicom
Nintendo SNES-SFC