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In daily use of computer we often use many types of computer files, some time we find files with unknown extensions, if you don’t understand how to open those files.
| Extension | File Type | |
| 1 | zip | Zip archive |
| 2 | pdf | PDF Document |
| 3 | mp3 | MP3 Audio File |
| 4 | mpg | MPEG-1 Video |
| 5 | wmv | Windows Media Video |
| 6 | avi | Audio Video Interleave |
| 7 | swf | SWF vector graphics |
| 8 | mpeg | MPEG 1 System Stream |
| 9 | mov | QuickTime |
| 10 | wav | Waveform Audio Format |
| 11 | wma | Windows Media Audio |
| 12 | mp4, m4a | MPEG-4 Part 14 |
| 13 | flv | Flash video |
| 14 | jpg | JPEG Image |
| 15 | rar | RAR Archive |
| 16 | exe | Executable file |
| 17 | doc | Microsoft Word Document |
| 18 | ppt | Microsoft PowerPoint Presentation |
| 19 | tif | Tagged Image File Format |
| 20 | psd | Photoshop Document |
| 21 | cdr | Corel Draw Vector or Raw Audio CD |
| 22 | xls | Microsoft Excel spreadsheet |
| 23 | txt | Plain text file |
| 24 | rmvb | RealMedia Variable Bitrate |
| 25 | bmp | Windows bitmap |
| 26 | pps | PowerPoint Show |
| 27 | pub | Microsoft Publisher |
| 28 | dwg | AutoCAD DWG |
| 29 | gif | GIF (Graphics Interchange Format) Image |
| 30 | indd | Adobe InDesign document |
| 31 | asf | Advanced Systems Format |
| 32 | png | Portable Network Graphics |
| 33 | dat | Data |
| 34 | rm | RealMedia |
| 35 | mdb | Microsoft Access |
| 36 | chm | Microsoft Compressed HTML Help |
| 37 | jar | Java ARchive |
| 38 | htm | Hypertext Markup Language (HTML) |
| 39 | dmg | Disk image |
| 40 | iso | Optical disk image |
| 41 | m4b | MPEG-4 Part 14 |
| 42 | 7z | 7z archive |
| 43 | gz | Gzip archive |
| 44 | fla | Adobe Flash |
| 45 | rtf | Rich Text Format |
| 46 | msi | Windows Installer |
| 47 | jpeg | JPEG image |
| 48 | 3gp | Third Generation Partnership Project |
| 49 | vob | DVD-Video Object |
| 50 | m4p | Protected AAC File |
| 51 | divx | DivX video |
| 52 | html | Hypertext Markup Language (HTML) document |
| 53 | cab | Microsoft Windows compressed archive |
| 54 | ttf | TrueType font |
| 55 | ptb | Script; PubTech BatchWorks |
| 56 | bin | Binary file |
| 57 | mswmm | Windows Movie Maker Project File |
| 58 | ifo | DVD Info File |
| 59 | tgz | Archive; WinZipNT – TAR – GNUzip |
| 60 | log | Log file |
| 61 | dll | Dynamic-link library |
| 62 | m4v | MPEG-4 Part 14 |
| 63 | eml | E-mail message |
| 64 | mid | Musical Instrument Digital Interface |
| 65 | ogg | Ogg |
| 66 | ram | RealAudio |
| 67 | lnk | Computer shortcut |
| 68 | torrent | BitTorrent |
| 69 | mp2 | MPEG-1 Audio Layer II |
| 70 | vcd | Virtual CD-ROM CD Image File |
| 71 | bat | Batch file |
| 72 | asx | Advanced Stream Redirector |
| 73 | ps | PostScript |
| 74 | amr | Adaptive Multi-Rate audio |
| 75 | sql | Structured Query Language |
Download This extension list in pdf : Click Here
