File Extensions

Emulation is a dizzying array of file extensions and file formats. This hopefully clears up some of it:

markdown:

ext	desc
dsk	floppy disk 5.25" 140k SD, apple2, mac, trs80, msx, DOS, cpc
dmk	floppy disk 5.25" 140k SD, apple2, trs80
do	floppy disk 5.25" 140k SD, DOS ordered
woz	floppy disk 5.25" 140k SD, apple2
nib	floppy disk 5.25" 140k SD Nibble format, apple2
d13	seen in asimoc, especially system disks
po	hard disk image, ?floppy to?, apple2
hdv	hard disk image, apple2
2mg	hard disk image, ?3.5" floppy too?
2img	hard disk image, ?3.5" floppy too?
hvf	hard disk image, basilisk/mac
t64	Commodore64 ?tape?
c64	Commodore64 ?cart?
trd	Sinclair Spectrum disk format
bas	usually a BASIC file to be executed on a legacy computer like Apple, Commodore, TR80
adf	CommodoreAmiga disk file
adz	compressed CommodoreAmiga disk file
ipf	COmmodoreAmiga disk format
dms	CommmodoreAmiga ?floppy? Disk Masher System
lha	compression format, but also a CommodoreAmiga file format
hdf	hard drive format esp Sinclair Spectrum and Sharp X68000
trd	Sinclair Spectrum disk
img	Sinclair Spectrum floppy disk
mgt	Sinclair Spectrum<
p	Sincalir zx1
iso	optical disc image file of an optical disk
bin cue	optical disc image bin is the data made by many apps
ccd img sub	optical disk image made by CloneCD, sub is the subchannel data
mdf mds	optical disk image made by Alcohol120%
cdi	optical disk image (CD-i + some others?), and gamecube
gdi	optical disk image for GameCube emulators
sbi	optical disk subchannel info, most commonly EU PSX copy protected games
gcz	optical disk image for Dolphin emulator
mdz	optical disk image for dolphin
nrg	optical disk image made by Nero Burning Rom
chd	compressed image of hard drive or optical disc
ecm	optical disk image that excludes ECC
a26	atari 2600 cart
a52	atari 5200 cart
a78	atari 7800 cart
lnx	atari lynx
bin	atari carts, sometimes
jag	Atari Jaguar cart
atr	atari cartidges or disks
xex	atari 8bit floppies
st	atari st (earlier format / floppies?)
stx	atari st
int	INtellivision cart
col	colecovision cart
rom	colecovision cart or bios/roms from a hardware board
tzx	Sinclair spectrum (compressed tape?)
tap	sinclair spectrum tape
trd	sinclair spectrum
ssd	Acorn BBCMicro/Electron disk
wsc	Bandai Wonderswan Color cart
n64	Nintendo64 cart
v64	Nintendo64 cart (Doctor V64)
z64	Nintendo64 cart (Zip Diskette N64 ROM)
ndd	Nintendo64 DD cart
nes	Nintendo NES cart
fds	Famicom Disk System aka Nintento NES disk
sfc	Super Famicon Cart aka Nintendo SNES cart
smd	Super Magic Drive aka SEGA 32X
32x	SEGA 32X
smc	Super Magicom aka Nintendo SNES cart
gg	SEGA gamegear cart
sms	SEGA Master System car
gen	SEGA Genesis
md	SEGA Genesis (Multi Doctor)
sg	SEGA 1000 computer cart
gb	Gameboy cart
gbc	Gameboy Color cart
gba	Gameboy Advance cart
pce	TurboGrafx16 aka NEC PC-Engine cart
rom	generally a cartridge dump of a Read-Only-Memory bank, often for bios
jar	ZIP-compressed bunch of compiled java code, j2me
zip	ZIP compressed file(s), probably the most common compression format
7z	7ZIP compressed file(s), a good open source compression format
rar	RAR compressed file(s) made by WinRAR, common, good, but closed source
ace	ACE compressed files(s) made by WinACE, uncommon,good, but closed source
gz	GZIP compressed file(s), an older compression format common in UNIX/Linux
tar	tape archive format, used to group files for backups or downloading in UNIX/Linux
bz2	compressed files(s), uncommon format
sit	StuffIt compressed file(s), usually need a mac to create or decompress
ips	binary patch file
wad	DOOM custom files/levels
001 part01 r01	split files
par par2	parity files for recovering from partial downloads, particularly in usenet