Audio and Music

Electronic Formats concerned with audio and musical data, including sound recording, instrument control, musical notation, etc.

Audio and sequencer software

 * AUP (Audacity)
 * BMX (Jeskola Buzz song)
 * Cakewalk
 * CWP (Cakewalk Project)
 * SFZ (Cakewalk Sample Definition File)
 * WRK (Cakewalk Project)
 * ENS (Native Instruments Reaktor ensemble)
 * Steinberg
 * CUBASE
 * ALL - A Steinberg CUBASE VST file for saving songs (pre 2002).
 * ARR - A Steinberg CUBASE VST file for saving arrangements (pre 2002).
 * CPR - A Steinberg CUBASE SX file for saving projects (2002 - ).
 * NPR - A Steinberg NUENDO file for saving arrangements (2002 - ).
 * FXP (VST preset)
 * Wavelab
 * MON (Audio montage)
 * FLP (FruityLoops / FL Studio project files)
 * LOGIC (Logic)
 * Pro Tools
 * PTS (Pro Tools 7-9)
 * PTX (Pro Tools 10)
 * Propellerhead Reason
 * REX - Propellerhead Reason ReCycle Loop File
 * RFL - Propellerhead Reason ReFill Sound Bank
 * RNS - Propellerhead Reason Reason Song File
 * RSN - Propellerhead Reason Reason Project File
 * RX2 - Propellerhead Reason REX2 Audio File
 * SX2 - Propellerhead Reason NN-XT Patch File
 * Renoise
 * NTK (Renoise Song)
 * PTK (Renoise Song)
 * RNS (Renoise Song)
 * XRNS (Renoise Song)
 * SES (Cool Edit / Audition) (Cool Edit / Audition Multi Track Session file)

Audio recording and sound waves

 * Container formats
 * ASF (Advanced Systems Format)
 * MP4 (MPEG-4 Part 14 media container)
 * OGG (Vorbis, CELT or Opus audio compression format)
 * RM (RealMedia)
 * Lossless compression
 * AAL (Lossless variant of ATRAC)
 * ADA (Advanced Digital Audio)
 * ALAC (Apple Lossless Audio Codec)
 * APAC (Marian's A-pac)
 * APE (Monkey's Audio)
 * Dakx Wav
 * DTS-HD (Lossless variant of DTS- DTS-HD Master Audio)
 * FLAC (Free Lossless Audio Codec)
 * LA (Lossless Audio)
 * LiteWave
 * LPAC (Lossless Predictive Audio Coding)
 * MLP (Meridian Lossless Packing Audio)
 * MPEG-4 ALS (MPEG-4 Audio Lossless Coding)
 * MPEG-4 SLS (MPEG-4 Scalable lossless coding mode)
 * OFR (OptimFROG lossless audio)
 * PCA (Sony's Perfect Clarity Audio)
 * RALF (Real Lossless Audio Codec)
 * RKA (RK Audio)
 * SHN (Shorten)
 * Sonarc
 * Split2000
 * TAK (Tom's Lossless Audio Kompressor)
 * TrueHD (Dolby TrueHD)
 * TTA (True Audio)
 * VocPack
 * WavArc
 * WavPack (WavPack Lossless)
 * WMA Lossless (Windows Media Audio 9 Lossless)
 * Lossy compression
 * AA (Audible Audiobook)
 * AAC (Advanced Audio Coding)
 * Adaptive differential pulse-code modulation
 * MNF (Yamaha ADPCM)
 * SPB (Yamaha ADPCM)
 * VOX
 * ATRAC (Adaptive Transform Acoustic Coding)
 * AAX (Audible Audiobook)
 * GSM (Raw GSM 6.10 Audio Stream)
 * M4A (MPEG-4 Audio)
 * M4B (iTunes Audio Book)
 * M4P (Fairplay DRM Encrypted M4A)
 * M4R (Apple iPhone Ringtones - see M4A)
 * MP+ (MPEGplus Audio)
 * MP1 (MPEG Audio Layer 1)
 * MP2 (MPEG-1 Audio Layer II)
 * MP3 (MPEG-1 / MPEG-2 Audio Layer III)
 * MPA (MPEG Audio)
 * MPC (Musepack Audio, formerly known as MPEGplus)
 * RA (RealAudio)
 * SPX (Speex)
 * WMA (Windows Media Audio)
 * Uncompressed audio
 * AIF / AIFF (Audio Interchange File Format)
 * LPCM (Linear Pulse Code Modulated Audio)
 * RAW (RAW audio)
 * WAV (Waveform Audio File Format)
 * Various encodings
 * AIFC (AIFF Compressed)
 * AU (Sun Microsystems audio format)

Emulated music

 * 2SF (Nintendo DS PSF)
 * DSF (Dreamcast PSF)
 * DSFLIB (DSF Library)
 * GSF (Game Boy Advance PSF)
 * GSFLIB (GSF Library)
 * MINIGSF (GSF track)
 * MINIPSF (PSF track)
 * MINIPSF2 (PSF2 track)
 * MINIQSF (QSF track)
 * MINISNSF (SNSF track)
 * MINISSF (SSF track)
 * MINIUSF (USF track)
 * PSF (Portable Sound Format)
 * PSF1 (Playstation PSF)
 * PSF2 (Playstation 2 PSF)
 * QSF (Capcom Q-Sound PSF)
 * QSFLIB (QSF Library)
 * SSF (Sega Saturn PSF)
 * SSFLIB (SSF Library)
 * USF (Nintendo 64 PSF)
 * USFLIB (USF library)

Game audio and music

 * Adept Software
 * God of Thunder Music Format
 * Atari
 * SAP (Atari POKEY)
 * Bandai
 * WSR (WonderSwan / WonderSwan Color)
 * CIN (Cinemaware)
 * CORE (Core Design)
 * CRI Middleware
 * ADX
 * AFS (container format for ADX / AHX (CRI))
 * AHX (CRI)
 * DI (Digital Illusions)
 * Electronic Arts
 * 8SV / 8SVX (IFF-8SVX)
 * IFF (Amiga 8SVX)
 * EMS (Editeur Musical Sequentiel)
 * Epic Megagames
 * MASI (Epic Megagames MASI)
 * PSM (Epic Megagames MASI)
 * id Software
 * DNF (id Software)
 * IMF (id Software Music Format)
 * WLF (id Software)
 * Interplay ACM (.acm)
 * INS (Infogrames)
 * J2B (XMP Game Module)
 * LucasArts
 * LAA (LucasArts Adlib Audio)
 * SCUMM (SCUMM)
 * Nintendo
 * ADP (Nintendo Gamecube)
 * AFC (Nintendo Gamecube)
 * AGSC (AGSC Audio File)
 * ASN (Nintendo Gamecube)
 * ASR (Nintendo Wii)
 * AST (Nintendo Wii sound format)
 * BRSTM (Nintendo Wii streaming format)
 * DSP (Donkey Konga 2)
 * GBR (Game Boy Sound)
 * GBS (Game Boy Sound)
 * GCA (Nintendo Wii)
 * GOT (God of Thunder)
 * KRAW (Nintendo Wii)
 * Origin Software
 * M (Origin Software - Ultima 6 Music)
 * Sierra
 * AGI (Sierra AGI)
 * SCI (Used in Sierra PC games)
 * Sony
 * ADS (PSX Audio)
 * ASS (Sony Playstation)
 * CCC (Sony Playstation)
 * DXH (Sony Playstation)
 * FAG (Sony Playstation)
 * FSB (Sony Playstation)
 * GMS (Sony Playstation)
 * KHV (Sony Playstation)
 * LEG (Sony Playstation)
 * I100 (Sony Playstation)
 * I400 (Sony Playstation)
 * I80 (Sony Playstation)
 * ILD (Sony Playstation)
 * KCES (Sony Playstation)
 * MI2 (Sony Playstation 2)
 * MI4 (Sony Playstation)
 * MIB (Sony Playstation)
 * MIC (Sony Playstation)
 * SPU (Sony Playstation)
 * VB2 (Playstation / PS2)
 * UMX (Unreal Music Format)
 * Union Logic Software Publishing
 * Vinyl Goddess From Mars Instrument Format
 * Vinyl Goddess From Mars Music Format
 * UDS (Unique Development Studios)
 * VGM (Videogame Music)
 * Westwood Studios
 * ADL (Westwood Studios)
 * AUD (Westwood Studios)

Metadata formats

 * MDZ - strictly not itself a music format, but a metadata file for other music files used by Open Cubic Player. See http://www.cubic.org/player/doc/node72.htm

Music trackers

 * 128 (Soundtrakker 128)
 * 1TM (1tracker)
 * 669 (Composer 669 module)
 * Adlib Tracker
 * A2B (Adlib Tracker II bank)
 * A2F (Adlib Tracker II instrument with fm-register macro)
 * A2I (Adlib Tracker II instrument)
 * A2M (Adlib Tracker II song format)
 * A2P (Adlib Tracker II pattern)
 * A2T (Adlib Tracker II tiny module)
 * A2W (Adlib Tracker II bank with macros)
 * AMusic module
 * Arkos Tracker (.aks)
 * BoomTracker v4.0
 * CFF (BoomTracker v4.0 song format)
 * CIF (BoomTracker 4.0 instrument)
 * BR (BeRoTracker)
 * BSF (BoyScout Tracker)
 * Chaos Music Composer
 * CM3 (CMC "3/4")
 * CMC (Chaos Music Composer)
 * CMR (CMC "Rzog")
 * CMS (Stereo Double CMC)
 * DMC (Double ChaosMusicComposer)
 * CyberTracker
 * CyberTracker instrument (.ci)
 * CyberTracker module (.ct)
 * CT2 (craptracker ii)
 * CUST (DeliTracker Custom)
 * DigiBooster / DigiBooster PRO
 * DBM (DigiBooster PRO v2.x / DigiBooster 3 module)
 * DIGI (DigiBooster v1.x module)
 * DTM (DeFy Adlib Tracker)
 * DTM (DigiTrekker)
 * DTM (Digital Tracker)
 * DTT (Desktop Tracker)
 * EX (Fashion Tracker)
 * Farandole Composer
 * F2R (Farandole Form 2.0)
 * FAR (Farandole Composer)
 * FPT (Farandole Composer pattern)
 * FSM (Farandole Composer Sample / Instrument)
 * USM (Unsigned FSM)
 * FastTracker / FastTracker 2
 * FT (FastTracker module)
 * XI (Extended instrument)
 * XM (Extended module)
 * FCHS (Fuchs Tracker)
 * FM-Kingtracker
 * FIB (FM-Kingtracker bank)
 * FIN (FM-Kingtracker instrument)
 * FMK (FM-Kingtracker song format)
 * FLS (Flash Tracker)
 * FLT (Startrekker / Audio Sculpturer)
 * FLX (Flex Tracker)
 * FNK (FunkTracker)
 * FTC (Fast Tracker)
 * FTM (FamiTracker)
 * Future Composer
 * FC (Future Composer v1.x)
 * FC13 (Future Composer v1.3)
 * FC14 (Future Composer v1.4)
 * FC3 (Future Composer v1.3)
 * FC4 (Future Composer v1.4)
 * Groumpf Tracker
 * GT2 (Groumpf Tracker)
 * GTK (Groumpf Tracker)
 * GTR (Global Tracker v1.x)
 * HSC AdLib Composer / HSC-Tracker
 * HSC (HSC AdLib Composer / HSC-Tracker)
 * HSP (HSC AdLib Composer / HSC-Tracker packed)
 * HVL (Hively Tracker)
 * IMF (Imago Orpheus)
 * Impulse Tracker
 * IT (ImpulseTracker module)
 * ITBZ (ImpulseTracker BZIP2)
 * ITGZ (ImpulseTracker GZIP)
 * ITR (ImpulseTracker RAR)
 * ITZ (ImpulseTracker ZIP)
 * ITS (Impulse Tracker Samples)
 * INS (HSC-Tracker/RAD-Tracker, SAdT, Amusic/AdLib instrument)
 * JAM (JAMCracker Pro)
 * KRIS (ChipTracker)
 * KT (klystrack Song)
 * LIQ (Liquid Tracker)
 * MAD (Mlat Adlib Tracker)
 * MAD (PlayerPRO module)
 * MDL (Digitrakker)
 * MGT (Megatracker)
 * MOD (Amiga Module)
 * ModPlug Tracker
 * MDBZ (ModPlug BZIP2)
 * MDGZ (ModPlug GZIP)
 * MDR (ModPlug Tracker RAR)
 * MDZ (ModPlug Tracker ZIP)
 * MPTM (Open MODPlug Tracker)
 * MT2 (MadTracker 2)
 * MTM (MultiTracker)
 * MTN (Soundtracker 2.6 / Ice Tracker)
 * Muse Tracker / Pornotracker
 * POI (Musetracker / Pornotracker instrument)
 * POM (Musetracker / Pornotracker song)
 * Music Pro Tracker
 * MD1
 * MD2
 * MPD (MPT DoublePlay)
 * MPT (Music Pro Tracker)
 * NED (NerdTracker II)
 * NEST (NesTracker)
 * NST (NoiseTracker)
 * NTK (Noisetrekker)
 * OctaMED
 * MED (OctaMED / MED SoundStudio module)
 * MED3 (MED 2.00)
 * MED4 (MED 2.10)
 * MMD0 (MED 2.10)
 * MMD1 (OctaMED)
 * MMD2 (OctaMED v5)
 * MMD3 (OctaMED SS)
 * Oktalyzer
 * OKT (Oktalyzer module)
 * OKTA (Oktalyzer module)
 * PLM (DisorderTracker II)
 * Pro Tracker
 * PT1 (Pro Tracker v1.xx)
 * PT2 (Pro Tracker v2.xx)
 * PT3 (Pro Tracker v3.xx)
 * PTM (PolyTracker)
 * Reality AdLib Tracker
 * SBStudio II (.pac, .son, .sou)
 * Scream Tracker
 * S3M (Scream Tracker 3 module)
 * S31 (ScreamTracker 3 / DigiTracker Samples)
 * SMP (ScreamTracker 3 / DigiTracker Samples)
 * STM (ScreamTracker module)
 * SKS (Starkos Tracker)
 * Soundtrakker
 * INS (Soundtrakker v1.x instrument)
 * INS (Soundtrakker 128)
 * SNG (Soundtrakker v1.x)
 * SNG (Soundtrakker 128)
 * ST26 (SoundTracker 2.6)
 * STC (Sound Tracker / Super Sonic)
 * STP (Sound Tracker Pro)
 * Surprise! Adlib Tracker
 * SAT (Surprise! AdLib Tracker v1, 5, 6)
 * Surprise! Adlib Tracker v2.0 (.sa2)
 * TFMX
 * MDAT (TFMX) (TFMX pattern data)
 * MDAT (TFMX 7V) (TFMX 7V)
 * MDAT (TFMX Pro) (TFMX Pro)
 * SMPL (TFMX sample data)
 * TP3 (Trackerpacker 3)
 * Ultra Tracker (.ult)
 * VT (VIC-TRACKER)
 * VTX (Vortex Tracker)
 * WOW (Grave Composer)
 * X-Tracker
 * D-Lusion Music File (.dmf)
 * D-Lusion Sound File (.dms)
 * XMS (XMS-Tracker)

Musical instrument control

 * ELECTONE - For Yamaha Electone Range Electronic Organs
 * BOO - Part of the ELECTONE format.
 * EVT - Part of the ELECTONE format.
 * MIDI & Clones
 * GMD (MIDI clone)
 * HMI (MIDI clone)
 * HMP (MIDI clone)
 * HMZ (Compressed MIDI)
 * KAR (MIDI Audio)
 * MIDI (Musical Instrument Digital Interface)
 * MIDS (MIDI clone)
 * MIZ (Compressed MIDI)
 * MSS (MIDI Clone)
 * Hardware specific
 * Akai
 * MLT (S-series MESA multi file)
 * PRG (S-series MESA I program)
 * S3P (S-series MESA II program)
 * BNK (AdLib instrument bank)
 * Creative Labs
 * CMF (Creative Music Format)
 * SBI (Sound Blaster Instrument)
 * DRO (DOSBox Raw OPL)
 * GYM (Genesis YM2612)
 * IBK (Instrument Bank)
 * RAW (AdLib Sound Card)

Musical notation

 * Guitar tablatures
 * tab, btab, txt - ASCII tab
 * gtp Guitar Pro
 * gp3 - Guitar Pro 3
 * gp4 - Guitar Pro 4
 * gp5 - Guitar Pro 5
 * gp6 - Guitar Pro 6
 * kg - KGuitar
 * ptb - Power Tab
 * Progression
 * rmtf - Rich MIDI Tablature Format
 * tef - TablEdit
 * VexTab


 * Musical notation
 * Capella
 * CAP
 * capx - CapXML
 * Copyist
 * CP4
 * CP6
 * enc - Encore
 * mus - Finale
 * fnf - Forte
 * GUIDO
 * Mup
 * MuseScore
 * MSC -(old file format)
 * MSCX - XML file format
 * MSCZ - GZIP compressed MSCX
 * mwk - MusicWrite
 * mus - Music Time
 * mts - Music Time Pro
 * msf - Myriad Software
 * opt - Neuratron Photoscore Format
 * Notation Interchange File Format
 * NoteAbility Pro
 * nwc - Noteworthy Composer and Music Publisher
 * NoteWriter
 * Notion
 * NtEd
 * ove - Overture
 * PriMus
 * rhp - Rhapsody Notation Program File
 * rg - Rosegarden
 * qsd - QuickScore Elite
 * mus - SCORE
 * spp - Score Perfect
 * scw - ScoreWriter
 * Sibelius
 * sss - Studio Session Song
 * Tilia
 * XMF

Playlist formats

 * B4S (Winamp 3 playlist)
 * FPL (foobar2000 playlist)
 * KPL (Kazaa Playlist Format)
 * M3U (Multimedia Playlist Format)
 * PLS (Multimedia Playlists)

#

 * 2DX (2DX Audio File)
 * 2DX9 (2DX9 Audio File)

A

 * AA3 (Advanced Transform Acoustic Coding)
 * AAM (Art & Magic)
 * AAAP (AAAP Audio File)
 * abk - AMOS Music Bank
 * AC1D (AC1D-DC1A Packer)
 * AC3 (Dolby Digital AC-3)
 * ACM (Audio Compression Manager)
 * ADM (ADM Audio File)
 * AFC (AFX Audio File)
 * AHX (Abyss) (Abyss Highest eXperience)
 * AIX (AIX Audio File)
 * ALM (Aley Keptr)
 * AMC (AM Composer)
 * AMD (Amusic)
 * AMF (ASYLUM Music Format / Advanced Music Format)
 * AMS (Velvet Studio AMS 1.x modules.)
 * AMTS (AMTS Audio File)
 * AON (Art of Noise)
 * AS4 (AS4 Audio File)
 * ASC (ASC Sound Master)
 * ASD (ASD Audio File)
 * AST (Actionamics Sound Tool)
 * AT3 (Advanced Transform Acoustic Coding)
 * AUD (INRS-Telecom)
 * AY (Amstrad CPC / ZX Spectrum)

B

 * B1S
 * BAF
 * BAKA
 * BAM (Bob's Adlib Music)
 * BAR
 * BBSONG (Beepola)
 * BD (Benn Daglish)
 * BDS (Benn Daglish SID)
 * BDSP
 * BG00
 * BGW
 * BH2PCM
 * BMDX
 * BMF (BR404 Music)
 * BNS
 * BNSF
 * BO2
 * BONK
 * BP (SoundMon 2.0) (SoundMon 2.0)
 * BP (SoundMon 2.2) (SoundMon 2.2)
 * BP3 (Brian Postma's SoundMon v3.x)
 * BPA (Death Rally Archive))
 * BRSTMPSM
 * BS (Brian Postma's SoundMon)
 * BSS (Beathoven Synthesiser)
 * BVG

C

 * CAF
 * CADSP
 * CBA (Chuck Biscuits+Black Artist)
 * CBD2
 * CFN (DSP File)
 * CHAN (Channel Players)
 * CM (CustomMade)
 * CNK
 * COP (SAM Coupe)
 * CPC (ZXAYEMUL Sound)
 * CPS
 * CRB (Heatseeker v1.0)
 * CUS (Custom Amiga Module)
 * CUSTOM (Custom Amiga Module)

D

 * D (SPPACK)
 * D00 (Packed EdLib Module)
 * DAT (Paul Robotham)
 * DCS
 * DCT (Format designed for dictation by NCH Software)
 * DDSP
 * DE2
 * DFM (Digital-FM)
 * DH (David Hanney)
 * DL (Dave Lowe)
 * DLN (Dave Lowe New)
 * DLS (Downloadable Sounds Banks)
 * DLT (Delta Music Composer)
 * DM2 (Delta Music 2.0)
 * DMO (Twin TrackPlayer)
 * DMSG
 * DNS (Dynamic Synthesizer)
 * DSC (Digital Sonix & Chrome)
 * DSM (DSIK Internal)
 * DSR (Desire)
 * DSP
 * DSPW
 * DSS (Digital Speech Standard)
 * DSYM (Digital Symphony)
 * DTK
 * DTS
 * DVF (Sony Digital Audio recorders)
 * DVI
 * DW (David Whittaker)
 * DZ (Darius Zendeh)

E

 * EAM (EA-XA)
 * EMFF
 * EMOD (Quadra Composer)
 * EPSGMOD (Mod2PSG)
 * EU (Eureka Packer)

F

 * FCM (FC-M Packer)
 * FFW
 * FILP
 * FMX (Fuxoft AY Language)
 * FP (Future Player)
 * FRED (Fred Editor)
 * FUZZ (Fuzzac Packer)
 * FW (FWMP)

G

 * GBTS
 * GCM (DSP File)
 * GCUB
 * GCW
 * GDM (General Digital Music)
 * GENH (artificial header for RAW files)
 * GMC (Game Music Creator)
 * GRAY (Fred Gray)
 * GSB
 * GSP (DSP File)
 * GSR (Gens Sound Record)

H

 * HAN (Digital Sound Creations)
 * HD (Howie Davies)
 * HES (Hudson Entertainment System)
 * HGC1
 * HIP (Jochen Hippel / TFMX)
 * HIPC (Hippel-COSO)
 * HIS
 * HIW (Jochen Hippel / TFM2)
 * HLWAV
 * HPS (DSP File)
 * HWAS

I

 * IAB
 * IADP
 * IDRUM (iZotope iDrum)
 * IDSP (DSP File)
 * IKM
 * IMS (Images Music System)
 * INT (RAW File)
 * ISD
 * ISH (DSP File)
 * ISWS
 * IVAUD
 * IVB

J

 * JBL (JBM Adlib Music)
 * JC (JCalG1 DataPacker)
 * JCB (Jason Brooke)
 * JD (Special FX)
 * JPO (Steve Turner)
 * JMF (Janko Mrsic-Flogel)
 * JO (Jesper Olsen)
 * JOE
 * JPN (Jason Page)
 * JSTM
 * JT (Jeroen Tel)

K

 * KCEY
 * KDM (Ken's Digital Music)
 * KH (Kris Hatlelid)
 * KHV
 * KI (klystrack Instrument)
 * KLM (Whacky Wheels)
 * KOVS
 * KSM (Ken's Adlib Music)
 * KSS (MSX)
 * KSSX (Possible expansion of KSS)

L

 * LDS (LOUDNESS Sound System)
 * LME (Leggless Music Editor)
 * LOGG
 * LPS
 * LWAV

M

 * MA (Music Assembler)
 * MADX (Extended MAD)
 * MATX
 * MBM (Moonblaster Music Format)
 * MC (Mark Cooksey)
 * MCG
 * MD (Mike Davies)
 * MDX (MXDRV16y Music File)
 * MDX (Sharp X68000)
 * MFP (Magnetic Fields Packer)
 * MIHB
 * MII (Mark II Sound-System)
 * MK2 (Mark 2 Sound System)
 * MKII (Mark II Sound System))
 * MKJ (MKJamz Audio)
 * MMDC (MMDC)
 * MML (Music Macro Language)
 * MNSTR
 * MO3 (MP3 / OGG Compressed ST-xx)
 * MOK (Silmarils)
 * MOL (MOD4WIN Module Lists)
 * MON (M.O.N New / Old)
 * MP (Module Protector + noID)
 * MPC (Mario Paint Composer)
 * MPDS
 * MPDSP (DSP File)
 * MSA
 * MSC (AdLib MSCplay)
 * MSF
 * MSQ (Mario Sequencer)
 * MSS (Advanced Mario Sequencer)
 * MSV (Sony dictation machines)
 * MSVP
 * MTAF
 * MTK (MPU-401 trakker)
 * MUG (Mugician)
 * MUG2 (Mugician II)
 * MW (Martin Walker)
 * MXM (Mxmplay)
 * MXTX (MaxTrax)
 * MYI (maxYMiser Instrument)

N

 * NP2 (NoisePacker v2.x)
 * NP3 (NoisePacker v3.x)
 * NSD (???)
 * NSF (NES Sound Format)
 * NSFE (Extended NSF)
 * NSP (Computerized Speech Lab)
 * NTP (NovoTrade Packer)

O

 * OMA (Advanced Transform Acoustic Coding)
 * ORC (TRS-80 Orchestra-90)
 * OSP (Synth Pack)

P

 * P4X (The Player v4.x)
 * P6X (The Player v6.x)
 * PAP (Pierre Adane Packer)
 * PAT (UltraSound GF1 Patches)
 * PCM (Pulse Code Modulation)
 * PHA (Pha Packer)
 * PIXI (Pixilang)
 * PP21 (ProPacker 2.1)
 * PP30 (ProPacker 3.0)
 * PR1 (Promizer)
 * PRU2 (Prorunner 2.0)
 * PRUN (Prorunner 1.0)
 * PS (Paul Shields)
 * PSA (Professional Sound Artists)
 * PSC (Pro Sound Creator v1.xx)
 * PSF (Soundfactory)
 * PSM (Pro Sound Maker)
 * PVP (Peter Verswyvelen Packer)

R

 * RH (Rob Hubbard)
 * RHO (Rob Hubbard Old)
 * Rich Music Format
 * RJP (Richard Joseph)
 * RK (Ron Klaren)
 * ROL (AdLib Visual Composer)

S

 * S98 (NEC PC-98)
 * SA (Sonic Arranger)
 * SAM (MOD Edit sample)
 * SB (Steve Barrett)
 * SCN (Sean Connolly)
 * SCR (Sean Conran)
 * SCT (Soundcontrol)
 * SD (ESPS sampled data file)
 * SDR (Synth Dream)
 * SF (Berkeley/IRCAM/Carl Sound Format)
 * SF2 (SoundFont 2.0 Sound Banks)
 * SFX (SoundFX)
 * SGC (Sega Master System / Game Gear / Colecovision)
 * SGI (Sound Generator 3.0 instrument)
 * SHI (ShroomTool Instrument)
 * SHO (Mario Paint)
 * SID (Commodore)
 * SID (Sidmon) (Sidmon)
 * SID2 (Sidmon II)
 * SJS (SoundPlayer)
 * SM (Sound Master)
 * SMUS (Sonix Music Driver)
 * SND (Atari ST)
 * SNDH (Atari ST)
 * SNG (GoatTracker)
 * SNG (SCC Musixx)
 * SNK (Paul Summers)
 * SPC (Super Nintendo SPC700)
 * SPL (Sound Programming Language)
 * SQT (SQ-Tracker)
 * SS (Speedy System)
 * SunVox

T

 * TF (Follin Player II)
 * TFMX (TFMX)
 * THM (Thomas Hermann)
 * TM2 (Theta Music Composer v2.x)
 * TM8 (8-channel stero TMC)
 * TMC (Theta Music Composer v1.x)
 * TME (The Musical Enlightenment)
 * TPU (Dirk Bialluch)
 * TW (Sound Images)

V

 * VGZ (GZipped VGM)
 * VSQ (Voice Sequence)

W

 * WB (Wally Beben)

X

 * XMF (Extensible Music Format)

Y

 * YM (Amstrad CPC / Spectrum ZX / Atari ST)

Z
See the Open Cubic Player homepage for a list of demo formats: http://www.cubic.org/player/features.html

See also Piano Rolls (which is under the Physical File Formats).