| .3G2 | Open Source | Ficheiros de Vídeo | 3GPP2 Multimedia File | Apple QuickTime Player | Apple |
| .3GA | Open Source | Ficheiros de Áudio | 3GPP Audio File | Apple QuickTime Player | Apple |
| .3GP | Various Developers | Ficheiros de Vídeo | 3GPP Media File | Apple QuickTime Player | Apple |
| .3GPA | Open Source | Ficheiros de Áudio | 3GPP Multimedia File | Apple QuickTime Player | Apple |
| .3GPP | Various Developers | Ficheiros de Vídeo | 3GPP Media File | Apple QuickTime Player | Apple |
| .3GPP2 | Apple | Ficheiros de Vídeo | Multimedia Files For Wireless Networks | Apple QuickTime Player | Apple |
| .3P2 | Open Source | Ficheiros de Áudio | 3GPP Multimedia File | Apple QuickTime Player | Apple |
| .AC3 | Various Developers | Ficheiros de Áudio | Audio Codec 3 File | Apple QuickTime Player | Apple |
| .AIF | Apple | Ficheiros de Áudio | Audio Interchange File Format | Apple QuickTime Player | Apple |
| .AIFC | Apple | Ficheiros de Áudio | Compressed Audio Interchange File | Apple QuickTime Player | Apple |
| .AIFF | Apple | Ficheiros de Áudio | Audio Interchange File Format | Apple QuickTime Player | Apple |
| .AL | ITU-T (International Telecommunication Union, Telecommunication Standardization Sector) | Ficheiros de Áudio | A-Law Compressed Sound Format | Apple QuickTime Player | Apple |
| .ALAW | ITU-T (International Telecommunication Union, Telecommunication Standardization Sector) | Ficheiros de Áudio | A-Law Compressed Sound Format | Apple QuickTime Player | Apple |
| .AMC | Pegasys | Ficheiros de Vídeo | AMC Video File | Apple QuickTime Player | Apple |
| .AMR | Open Source | Ficheiros de Áudio | Adaptive Multi-Rate Codec File | Apple QuickTime Player | Apple |
| .AU | Open Source | Ficheiros de Áudio | Audacity Audio File | Apple QuickTime Player | Apple |
| .AVI | Microsoft Corporation | Ficheiros de Vídeo | Audio Video Interleave File | Apple QuickTime Player | Apple |
| .AWB | Nokia | Ficheiros de Áudio | AMR-WB Audio File | Apple QuickTime Player | Apple |
| .AX | Open Source | Ficheiros Plugin | DirectShow Filter | Apple QuickTime Player | Apple |
| .BUB | Apple | Uncommon Files | Photobubble File | Apple QuickTime Player | Apple |
| .CAF | Apple | Ficheiros de Áudio | Apple Core Audio File | Apple QuickTime Player | Apple |
| .CAFF | Apple | Ficheiros de Áudio | Core Audio File | Apple QuickTime Player | Apple |
| .CEL | Affymetrix | Ficheiros de Dados | Affymetrix Probe Results File | Apple QuickTime Player | Apple |
| .DIF | Microsoft Corporation | Ficheiros de Dados | Data Interchange Format | Apple QuickTime Player | Apple |
| .DNP | Apple | Ficheiros de Configurações | DRM Digital Rights Management Data | Apple QuickTime Player | Apple |
| .DV | Roxio | Ficheiros de Vídeo | Digital Video File | Apple QuickTime Player | Apple |
| .DVX | DivX, LLC. | Ficheiros de Vídeo | DivX Video File | Apple QuickTime Player | Apple |
| .FLC | Autodesk, Inc. | Ficheiros de Vídeo | FLIC Animation | Apple QuickTime Player | Apple |
| .FLH | Apple | Ficheiros de Vídeo | FLIC Animation File | Apple QuickTime Player | Apple |
| .FLI | Autodesk, Inc. | Ficheiros de Vídeo | FLIC Animation | Apple QuickTime Player | Apple |
| .FLV | Adobe Systems Incorporated | Ficheiros de Vídeo | Animate Video File | Apple QuickTime Player | Apple |
| .FLX | Autodesk, Inc. | Ficheiros de Vídeo | FLIC Animation | Apple QuickTime Player | Apple |
| .GPD | Microsoft Corporation | Ficheiros de Texto | Generic Printer Description File | Apple QuickTime Player | Apple |
| .H264 | Ulead Systems | Ficheiros de Vídeo | H.264 Encoded Video File | Apple QuickTime Player | Apple |
| .HDMOV | Apple | Ficheiros de Vídeo | QuickTime HD Movie File | Apple QuickTime Player | Apple |
| .IFF | Electronic Arts | Ficheiros de Áudio | Interchange File Format | Apple QuickTime Player | Apple |
| .IFV | Intel Corporation | Ficheiros de Vídeo | Indeo Video Format File | Apple QuickTime Player | Apple |
| .IPS | ZeroSoft Zophar | Ficheiros de Jogo | Internal Patching System Patch File | Apple QuickTime Player | Apple |
| .IVF | Intel Corporation | Ficheiros de Vídeo | Indeo Video Format File | Apple QuickTime Player | Apple |
| .IVS | Thomas d'Otreppe de Bouvette | Ficheiros de Dados | Initialization Vector File | Apple QuickTime Player | Apple |
| .J2K | Joint Photographic Experts Group | Ficheiros de Imagem Raster | JPEG 2000 Image | Apple QuickTime Player | Apple |
| .JPF | Joint Photographic Experts Group | Ficheiros de Imagem Raster | JPEG 2000 Image | Apple QuickTime Player | Apple |
| .JPG2 | Joint Photographic Experts Group | Ficheiros de Imagem Raster | JPEG 2000 Image | Apple QuickTime Player | Apple |
| .JPX | Embarcadero Technologies | Ficheiros de Desenvolvedor | JBuilder Project | Apple QuickTime Player | Apple |
| .LRV | Konica Minolta | Ficheiros de Dados | Konica Minolta Data Management Software Stored File | Apple QuickTime Player | Apple |
| .M15 | Moving Picture Experts Group | Ficheiros de Vídeo | MPEG Video File | Apple QuickTime Player | Apple |
| .M1A | Open Source | Ficheiros de Áudio | MPEG-1 Audio File | Apple QuickTime Player | Apple |
| .M1V | Roxio | Ficheiros de Vídeo | MPEG-1 Video File | Apple QuickTime Player | Apple |
| .M21 | AXMEDIS Products and Services | Ficheiros de Vídeo | AXMEDIS MPEG-21 File | Apple QuickTime Player | Apple |
| .M2A | Unknown Developer | Ficheiros de Vídeo | MPEG-1 Layer 2 Audio File | Apple QuickTime Player | Apple |
| .M2S | Maxthon | Ficheiros de Configurações | Maxthon 2 Browser Skin File | Apple QuickTime Player | Apple |
| .M2V | Webteh | Ficheiros de Vídeo | MPEG-2 Packetized Elementary Stream | Apple QuickTime Player | Apple |
| .M4A | Apple | Ficheiros de Áudio | MPEG-4 Audio File | Apple QuickTime Player | Apple |
| .M4P | Apple | Ficheiros de Áudio | iTunes Music Store Audio File | Apple QuickTime Player | Apple |
| .M4U | Open Source | Ficheiros de Vídeo | MPEG-4 Playlist | Apple QuickTime Player | Apple |
| .M4V | Apple | Ficheiros de Vídeo | iTunes Video File | Apple QuickTime Player | Apple |
| .M75 | Moving Picture Experts Group | Ficheiros de Vídeo | MPEG Video File | Apple QuickTime Player | Apple |
| .MAC | Apple | Ficheiros de Imagem Raster | MacPaint Image | Apple QuickTime Player | Apple |
| .MID | Open Source | Ficheiros de Áudio | MIDI Audio File | Apple QuickTime Player | Apple |
| .MIDI | Synthesia LLC | Ficheiros de Áudio | MIDI File | Apple QuickTime Player | Apple |
| .MJP | LG Electronics | Ficheiros de Vídeo | MJPEG Video File | Apple QuickTime Player | Apple |
| .MOO | Apple | Ficheiros de Vídeo | Apple QuickTime Movie Clip File | Apple QuickTime Player | Apple |
| .MOOV | Apple | Ficheiros de Vídeo | Apple QuickTime Movie | Apple QuickTime Player | Apple |
| .MOV | Apple | Ficheiros de Vídeo | Apple QuickTime Movie | Apple QuickTime Player | Apple |
| .MOVIE | Apple | Ficheiros de Vídeo | QuickTime Movie File | Apple QuickTime Player | Apple |
| .MP21 | AXMEDIS Products and Services | Ficheiros de Vídeo | AXMEDIS MPEG-21 Object | Apple QuickTime Player | Apple |
| .MP2V | Roxio | Ficheiros de Vídeo | MPEG-2 Video File | Apple QuickTime Player | Apple |
| .MP4 | Moving Picture Experts Group | Ficheiros de Vídeo | MPEG-4 Video File | Apple QuickTime Player | Apple |
| .MP4V | Moving Picture Experts Group | Ficheiros de Vídeo | MPEG-4 Video File | Apple QuickTime Player | Apple |
| .MPA | Unknown Developer | Ficheiros de Áudio | MPEG-2 Audio File | Apple QuickTime Player | Apple |
| .MPE | Unknown Developer | Ficheiros de Vídeo | MPEG Movie | Apple QuickTime Player | Apple |
| .MPEG | Unknown Developer | Ficheiros de Vídeo | MPEG Movie | Apple QuickTime Player | Apple |
| .MPG | Moving Picture Experts Group | Ficheiros de Vídeo | MPEG Video File | Apple QuickTime Player | Apple |
| .MPG4 | Moving Picture Experts Group | Ficheiros de Vídeo | MPEG-4 Video File | Apple QuickTime Player | Apple |
| .MPV2 | Roxio | Ficheiros de Vídeo | MPEG-2 Video Stream | Apple QuickTime Player | Apple |
| .MQV | Sony | Ficheiros de Vídeo | Sony Movie Format File | Apple QuickTime Player | Apple |
| .MXF | SMPTE | Ficheiros de Vídeo | Material Exchange Format File | Apple QuickTime Player | Apple |
| .OGX | Xiph.Org | Ficheiros de Vídeo | Ogg Vorbis Multiplexed Media File | Apple QuickTime Player | Apple |
| .PANO | Microsoft Corporation | Ficheiros de Imagem Raster | Camera Panoramic Picture | Apple QuickTime Player | Apple |
| .PIC | John Bridges | Ficheiros de Imagem Raster | Generic Picture File | Apple QuickTime Player | Apple |
| .PIQT | Apple | Ficheiros de Dados | Apple QuickTime Still File | Apple QuickTime Player | Apple |
| .PLUGIN | Adobe Systems Incorporated | Ficheiros Plugin | Adobe Photoshop Plugin | Apple QuickTime Player | Apple |
| .QDAT | Apple | Ficheiros de Dados | QuickTime Install Cache File | Apple QuickTime Player | Apple |
| .QIF | Intuit, Inc. | Ficheiros de Dados | Quicken Interchange Format File | Apple QuickTime Player | Apple |
| .QPX | Microsoft Corporation | Ficheiros Executáveis | FoxPro Compiled Query Program | Apple QuickTime Player | Apple |
| .QT | Apple | Ficheiros de Vídeo | Apple QuickTime Movie | Apple QuickTime Player | Apple |
| .QTC | Apple | Ficheiros de Vídeo | Apple QuickTime Support File | Apple QuickTime Player | Apple |
| .QTCH | Apple | Ficheiros de Vídeo | QuickTime Cache File | Apple QuickTime Player | Apple |
| .QTI | Apple | Ficheiros de Imagem Raster | QuickTime Image File | Apple QuickTime Player | Apple |
| .QTIF | Apple | Ficheiros de Imagem Raster | QuickTime Image File | Apple QuickTime Player | Apple |
| .QTL | Apple | Ficheiros de Vídeo | QuickTime Link File | Apple QuickTime Player | Apple |
| .QTM | Apple | Ficheiros de Vídeo | Apple QuickTime Movie | Apple QuickTime Player | Apple |
| .QTP | Apple | Ficheiros de Configurações | QuickTime Preferences File | Apple QuickTime Player | Apple |
| .QTR | Apple | Ficheiros Plugin | QuickTime Extension Resource | Apple QuickTime Player | Apple |
| .QTS | Apple | Ficheiros de Sistema | QuickTime System File | Apple QuickTime Player | Apple |
| .QTV | Apple | Ficheiros de Dados | QuickTime Virtual Reality File | Apple QuickTime Player | Apple |
| .QTX | Apple | Ficheiros Plugin | QuickTime Extension File | Apple QuickTime Player | Apple |
| .QTZ | Apple | Ficheiros de Vídeo | Quartz Composer File | Apple QuickTime Player | Apple |
| .RGB | Silicon Graphics, Inc. | Ficheiros de Imagem Raster | RGB Bitmap | Apple QuickTime Player | Apple |
| .RMI | Open Source | Ficheiros de Áudio | RMID MIDI File | Apple QuickTime Player | Apple |
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