List of filetypes

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Archives
File ext. Name System Notes
.rar Compressed Archive Use WinRAR or 7-Zip to open and extract.
.7z/.7zip Compressed Archive Use WinRAR or 7-Zip to open and extract.
.zip Compressed Archive Use WinRAR or 7-Zip to open and extract.
.tar.gz Compressed Archive Use WinRAR or 7-Zip to open and extract.
.001/.part1/.r01 Split Archive Use WinRAR or 7-Zip to open and extract.
.gzip Compressed Archive Use 7-Zip to open and extract. Can be loaded by PCSX2 directly.
Disc/Disk Images
File ext. Name System Notes
.iso/.img Disk Image Multiple
.ccd CloneCD Control File Multiple Usually comes with .img files.
.bin Binary File Multiple Usually accompanied with, and used by, a cue sheet.
.cue Cue Sheet Multiple Metadata file for .bin/.iso/.img tracks.
.chd Compressed Hard Disk MAME/MESS
.mdf Media Descriptor File Multiple Disc image made from Alcohol 120%
.mds Media Descriptor Sheet Multiple Similar to .cue or .ccd, but for .mdf files.
.ecm Error Code Modeler PlayStation Compressed PS1 disc image, use UnECM to decompress it.
.cso Compressed ISO PS2/PSP/GC/Wii Compressed disc image, see here to convert to and from .iso
.gcz Compressed Dolphin ISO GC/Wii Compressed Wii/GC disc image, see here to convert to and from .iso
.cdi/.gdi CD Image Dreamcast Typically used with Dreamcast, CDI is a compressed GDI
.sbI CD Image Sub-channel data. Generally used in the case of PS1 for Digital Rights Management
.fds Famicom Disk System NES
Tape Files
File ext. Name System Notes
.wav Waveform Audio File Format Tape Based Systems Raw data in audio format†
.tap Tape File Tape Based Systems Raw tape data usable by appropriate emulators
.tzx ZX Spectrum Tape File Compatible Tape Based Systems (ZXS, CPC, C64, etc.) Prefered file type for all emulators, perfect representation
.cdc CPC Digital Tape Amstrad CPC Identical to the .tzx file but useable only by Amstrad CPC emulators
†When listened to, the file will play white noise. If this noise is perfectly recorded on to a tape, that tape should theoretically be able to be used on a system. In practice how ever, this is more difficult to do, as any interference can potentially ruin the tape and some copy protection systems may render the re-recording unusable
ROM Images
File ext. Name System Notes
.nes NES ROM NES
.smc Super Magicom SNES Headered ROMs dumped from a Super Magicom copier.
.sfc Super Famicom ROM SNES Headerless SNES ROM
.md Multi Game Doctor Genesis ROMs dumped from a Multi Game Doctor
.smd Super Magic Drive Genesis Headered ROMs dumped from a Super Magic Drive
.gen Genesis ROM Genesis Headerless Genesis ROM
.gg Game Gear ROM Game Gear
.z64 Zip Diskette N64 ROM Nintendo 64 Headered N64 ROMS dumped with a Mr. Backup Z64
.v64 Doctor V64 Nintendo 64 Headered N64 ROMS dumped with a Doctor V64
.n64 N64 ROM Nintendo 64
.gb GameBoy ROM GameBoy
.gbc GBC ROM GameBoy Color
.gba/.srl GBA ROM GameBoy Advance
.gcm GameCube Master Image GameCube GC disc dumped the way it's read
.gcz Compressed GameCube Disc Image GameCube Can be either a compressed .gcm or .iso
.nds/.srl NDS ROM Nintendo DS
.dsi/.nds/.srl DSiWare ROM DSiWare Different from regular DS ROMs.
.wbfs Wii Backup File System Wii Use WBFS Manager to convert to and from .iso
.wad Game Data File Wii/Doom Use for Wii channels and old FPS games
.cia CTR Importable Archive 3DS
.3ds 3DS ROM 3DS
.ngp/.ngc NGP/C ROM Neo Geo Pocket/Color
.pce PC Engine ROM PC Engine
.vb Virtual Boy ROM Virtual Boy Also used for Visual Basic source files
.ws / .wsc WonderSwan (Color) ROM WonderSwan/Color
.ipa Apple iPhone App Data iOS
.apk Android App Data Android
.obb Android App Data Ressources Android
Saves
File ext. Name System Notes
.dsv DeSmuMe Save NDS
.ds1 to .ds9 DeSmuMe Save State NDS
.sav Save file Multiple
.ps2 PCSX2 Memory Card PS2
.mcr Memory Card Reader PS1 PS1 emulator memory card
.mpk Memory Pack Nintendo 64 N64 saves
.eep EEPROM Nintendo 64 N64 saves
.st0/.sta/ Savestate Multiple
.srm Save RAM SNES/Genesis Save RAM dump, used with emulators and flashcarts
Shaders and Filters
File ext. Name System Notes
.cg C for Graphics Nvidia's shader format based on C's syntax.
.glsl OpenGL Shading Language / GLslang OpenGL only shader format based on C's syntax.
.hlsl High-level shader language Windows, Xbox, 360 Microsoft's proprietary DirectX only shader language, based on C's syntax.
Other
File ext. Name System Notes
.elf Executable and Linkable Format PS2/PS3/GC/Wii Typically a homebrew/small application file
.pbp Perl Builder File PlayStation Portable Game and homebrew eboot file, also used for PS1 ISO storage (eboot.pbp)
.dol Dolphin File GameCube/Wii Executable
.xex Xbox Executable Xbox/X360 Xbox Executable. Usually comes with a folder with game data. X360 ones can be loaded by Xenia.
.cfg/.ini Configuration File Multiple Use a text editor such as notepad/Notepad++ to edit
.dll Dynamic Link Library Multiple Typically used for plugins/emulation cores in emulators
.so Shared Library Multiple Typically used for plugins/emulation cores in emulators
.xml Extensible Markup Language MAME/MESS Contains various information about emulated systems and ROMs.
.hsi XML-like MESS Contains various information about ROMs.
.lay Layout MAME/MESS XML-like file used to describe the visual layout of artwork overlays and placement of emulation input/output.
.nv Non Volatile RAM MAME/MESS Created by default to store nvram of emulated systems or software in the nvram folder.