| Format | Description |
| .3FR | Camera RAW Image File (Hasselblad) |
| .3G2 | Video file for 3G CDMA2000 multimedia services |
| .3GP | Video file for 3G mobile phones |
| .4XM | 4X Technologies Video File |
| .AAC | Audio file in Advanced Audio Coding format |
| .AC3 | Audio file in Audio Codec 3 format |
| .ACT | ACT Voice Audio File |
| .AEA | MD Studio Audio File |
| .AIFF | Audio Interchange File Format Audio File |
| .ALL | ImageEn Vector Objects and Layers File |
| .AMR | Audio speech file in Adaptive Multi-Rate format |
| .ANI | Animated cursor |
| .ANM | Deluxe Paint Animation Video File |
| .APC | Cryo Interactive Entertainment Audio File |
| .APE | Audio file in Monkey's Audio format |
| .ARW | Camera RAW Image File (Sony) |
| .ASF | Advanced/Active Streaming Format Video File |
| .ASP | Microsoft Active Server Page |
| .ASPX | Microsoft Extended Active Server Page |
| .AU | Sun Microsystems Audio File |
| .AVI | Video file in Audio Video Interleave format |
| .BAK | Backup file |
| .BAT | DOS Batch File |
| .BAY | Camera RAW Image File (Casio) |
| .BIK | RAD Game Tools Bink Video File |
| .BIN | Binary data file |
| .BMP | Bitmap Image file |
| .BW | Raw Black and White Bitmap |
| .CAF | Apple Core Audio Format Audio File |
| .CAFF | Apple Core Audio Format Audio File |
| .CAM | Camera RAW Image File (Casio) |
| .CDG | CD Graphics Video File |
| .CDXL | Commodore Amiga Video File |
| .CFG | Configuration File |
| .CONF | Configuration File |
| .CONFIG | Configuration File |
| .CPK | Sega Film Format Video File |
| .CR2 | Camera RAW Image File (Canon) |
| .CRW | Camera RAW Image File (Canon) |
| .CS1 | Camera RAW Image File (Capture Shop) |
| .CSS | Cascading Style Sheet File |
| .CSV | Comma Separated Values File |
| .CUR | Cursor image or animation |
| .CUT | Dr. Halo image |
| .DAT | Data file |
| .DC2 | Camera RAW Image File (Kodak) |
| .DCM | Digital Imaging and Communications in Medicine Image File |
| .DCR | Camera RAW Image File (Kodak) |
| .DCS | Camera RAW Image File (Kodak) |
| .DCX | Multipage PCX Image File |
| .DIB | Device-Independent Bitmap Graphic file |
| .DIC | Digital Imaging and Communications in Medicine Image File |
| .DICOM | Digital Imaging and Communications in Medicine Image File |
| .DIVX | Video file in DivX format |
| .DIZ | Description file |
| .DNG | Digital Negative RAW Image File (Adobe) |
| .DOC | Microsoft Word 97-2003 Document |
| .DOCM | Microsoft Word 2007+ Macro-Enabled Document |
| .DOCX | Microsoft Word 2007+ Document |
| .DOT | Microsoft Word 97-2003 Template Document |
| .DOTX | Microsoft Word 2007+ Template Document |
| .DTS | Audio file in Digital Theater Systems format |
| .EAC3 | Raw E-AC-3 Audio File |
| .EMF | Windows Enchanced Metafile |
| .ERF | Camera RAW Image File (Epson) |
| .FAX | Fax document |
| .FFF | Camera RAW Image File (Imacon) |
| .FLAC | Audio file in Free Lossless Audio Codec format |
| .FLV | Video file in Flash format for use on the Internet |
| .G3F | Zetafax Fax Image File (Fine) |
| .G3N | Zetafax Fax Image File (Normal) |
| .G722 | Raw G.722 Audio File |
| .GIF | Graphical Interchange Format image file |
| .GSM | Raw GSM (cell phone) Audio File |
| .GXF | General eXchange Format Video File |
| .H261 | Raw H.261 Video File |
| .H263 | Raw H.263 Video File |
| .H264 | Raw H.264 Video File |
| .HDP | Microsoft HD Photo File |
| .HTML | HTML document |
| .ICB | Truevision Advanced Raster Graphics Adapter Image File |
| .ICO | Icon file |
| .IEV | ImageEn Vector Objects File |
| .IFF | Interchange File Format Image File |
| .IIQ | Camera RAW Image File (Phase One) |
| .INFO | Informational file |
| .INI | Windows Initialization File |
| .IRCAM | Berkeley/IRCAM/CARL Audio File |
| .J2C | JPEG 2000 Code Stream Image File |
| .J2K | JPEG 2000 Code Stream Image File |
| .JFIF | JPEG File Interchange Format |
| .JIF | JPEG Interchange Format Image File |
| .JP2 | JPEG 2000 Core Image File |
| .JPC | JPEG 2000 Code Stream Image File |
| .JPE | JPEG Image File |
| .JPEG | JPEG Image File |
| .JPG | JPEG Image File |
| .JXR | Microsoft HD Photo File |
| .K25 | Camera RAW Image File (Kodak) |
| .KDC | Camera RAW Image File (Kodak) |
| .LOG | Log File |
| .LVF | Lossless Video Format Video File |
| .LXF | VR Native Stream Video File |
| .LYR | ImageEn Layers File |
| .M4A | Audio file in MPEG-4 Audio Layer format |
| .M4V | Video file in iTunes format |
| .MANIFEST | Application manifest file |
| .MDC | Camera RAW Image File (Minolta) |
| .MEF | Camera RAW Image File (Mamiya) |
| .MKA | Audio file in Matroska Audio Stream format |
| .MKV | Video file in Matroska format |
| .MLP | Meridian Lossless Packing Audio File |
| .MOS | Camera RAW Image File (Leaf) |
| .MOV | Video file in QuickTime Movie format |
| .MP2 | Audio file in MPEG-1 Audio Layer II format |
| .MP3 | Audio file in MPEG-1 or MPEG-2 Audio Layer III format |
| .MP4 | Video file that uses MPEG-4 compression |
| .MPA | Audio file in MPEG Audio File format |
| .MPC | Audio file in Musepack Compressed Audio format |
| .MPEG | Video file in MPEG format |
| .MPG | Video file in MPEG format |
| .MRW | Camera RAW Image File (Minolta) |
| .MV | Silicon Graphics Movie Video File |
| .MVI | Motion Pixels MVI Video File |
| .MXF | Material eXchange Format Video File |
| .NEF | Camera RAW Image File (Nikon) |
| .NRW | Camera RAW Image File (Nikon) |
| .NSV | Nullsoft Streaming Video File |
| .NUT | Experimental new open format Video File |
| .NUV | NuppelVideo Video File |
| .OFR | Audio file in OptimFrog Audio format |
| .OGG | Ogg Vorbis Audio File |
| .OGM | Ogg Media Video File |
| .OGV | Ogg Video File |
| .ORF | Camera RAW Image File (Olympus) |
| .PAF | Amazing Studio Packed Audio File |
| .PAL | Dr. Halo image |
| .PBM | Portable Bitmap Image File |
| .PCC | ZSoft Paintbrush Image File |
| .PCD | Kodak Photo-CD Image File |
| .PCX | ZSoft Paintbrush image File |
| .PDD | Adobe PhotoDeluxe Image File |
| .PDF | Adobe Portable Document Format |
| .PEF | Camera RAW Image File (Pentax) |
| .PGM | Portable Gray Map Image File |
| .PHP | Hypertext Preprocessor File |
| .PIC | Generic Picture File |
| .PIX | Truevision Advanced Raster Graphics Adapter Image File |
| .PMP | Playstation Portable PMP Video File |
| .PNG | Portable Network Graphics Image File |
| .PPM | Portable Pixmap Image File |
| .PSD | Adobe Photoshop Image File |
| .PSP | Paint Shop Pro Image File |
| .PTX | Camera RAW Image File (Pentax) |
| .PVF | Portable Voice Format Audio File |
| .PXM | Portable Pixmap Image File |
| .PXN | Camera RAW Image File (Logitech) |
| .QCP | Qualcomm QCP Audio File |
| .RA | Audio file in Real Audio format |
| .RAF | Camera RAW Image File (Fuji) |
| .RAW | Camera RAW Image File (Various) |
| .RDC | Camera RAW Image File (Digital Foto Maker) |
| .RGB | RGB Bitmap image file |
| .RGBA | SGI RGBA Image file |
| .RLA | SGI Alias/Wavefront RLA image |
| .RLE | Run Length Encoded Bitmap |
| .RM | Video file in Real Media format |
| .RMVB | Video file in Real Media Variable Bit Rate format |
| .ROQ | Id Software ROQ Video File |
| .RPF | SGI Alias/Wavefront RPF image file |
| .RPL | RPL / ARMovie Video File |
| .RTF | Rich Text Format |
| .RW2 | Camera RAW Image File (Panasonic) |
| .RWL | Camera RAW Image File (Leica) |
| .SGI | Silicon Graphics Image File |
| .SHN | Shorten Audio File |
| .SMK | Smacker Video File |
| .SPX | Audio speech file in Speex format |
| .SR2 | Camera RAW Image File (Sony) |
| .SRF | Camera RAW Image File (Sony) |
| .SRW | Camera RAW Image File (Samsung) |
| .SWF | ShockWave Flash Video File |
| .TARGA | Truevision Advanced Raster Graphics Adapter Image File |
| .TGA | Truevision Advanced Raster Graphics Adapter Image File |
| .TIF | Tagged Image File |
| .TIFF | Tagged Image File |
| .TMP | Temporary file |
| .TTA | Audio file in The True Audio Codec format |
| .TXD | Renderware TeXture Dictionary Video File |
| .TXT | Text file |
| .V2 | Digital Imaging and Communications in Medicine Image File |
| .VDA | Truevision Advanced Raster Graphics Adapter Image File |
| .VMD | Sierra VMD Video File |
| .VOB | Video file in DVD format |
| .VOC | Creative Voice Audio File |
| .VQF | Nippon Telegraph & Telephone Co. TwinVQ Audio File |
| .VST | Truevision Advanced Raster Graphics Adapter Image File |
| .W64 | Sony Wave64 Audio File |
| .WAV | Audio file in Waveform Audio format |
| .WBMP | Wireless Bitmap Image File |
| .WDP | Microsoft HD Photo File |
| .WIN | Truevision Advanced Raster Graphics Adapter Image File |
| .WMA | Audio file in Windows Media Audio format |
| .WMF | Windows Meta File |
| .WMV | Video file in Windows Media Video format |
| .WV | Raw WavPack Audio File |
| .X3F | Camera RAW Image File (Sigma) |
| .XA | Maxis Audio File |
| .XIF | Extended Image Format Image File |
| .XLS | Microsoft Excel File |
| .XLSM | Microsoft Excel 2007+ File with Macros |
| .XLSX | Microsoft Excel 2007+ File |
| .XML | XML Document |
| .XMV | Microsoft XBOX Audio/Video File |
| .XVID | Video file in the free XVID format |
| .XWMA | Microsoft XWMA Audio File |
| .YOP | Psygnosis Game Video File |
All other file types can also be opened with Free File Viewer, but will be displayed as a hexdump that can be inspected and printed.