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Thread: File extensions.....

  1. #1

    File extensions.....

    Ok this ain't a question but I thought it might come in handy for some newbies - a list of the majority of common file extensions (the letters after the "." of a file - to see them on your windows machine open a folder then go to view -> options. There should be an option that says something like "hide all known file extensions" un-check it and viola you can see them all)

    .ai Adobe Illustrator file

    .asp Active Server Pages. Pages created with ASP are dynamic and add interactivity to the web site.

    .avi Movie files for use with the Windows Media Player.

    .bak Backup files. This extension is commonly used in Windows as applications will make backup copies of documents with this extension.

    .bat Batch files mainly used in DOS.

    .bmp Bit-mapped files used for graphics such as Windows wallpaper.

    .cal Files used with the Windows Calendar program.

    .cbt Tutorial files usually used with Microsoft programs.

    .cfg Files used to store information for MIDI components.

    .com Command files mainly used in DOS.

    .css Cascading Style Sheets

    .dat Data files used by programs to store information.

    .dll Dynamic Link Library files that help Windows program perform smoothly.

    .doc Word processing document files most commonly associated with Microsoft Word.

    .drv Device driver files that are used by hardware components to run smoothly.

    .eps Files containing information designed for PostScript printers.

    .exe Program files that actually run a program. Commonly associated with Windows applications.

    .fla Macromedia Flash source file

    .gif Graphics and picture files in a compressed format.

    .html Website pages. HTML is an acronym for Hypertext Markup Language. Also website pages can end in .htm.

    .ico Files representing icons such as Windows.

    .inf Information files for programs during the installation process.

    .ist Adobe ImageStyler file

    .jpeg High-quality picture and image files. Also in .jpg extension.

    .js JavaScript code files

    .mdb Microsoft Access database file

    .mid Sound files that contain musical notes. Also known as MIDI files.

    .net Network files

    .pdf Files that are created by Adobe Acrobat.

    .reg Registrey key that contains licensing info to legalize the installation of an application.

    .scr Windows screen savers

    .sea Macintosh self extracting file.

    .shtml Website pages that includes Server Side code.

    .sit The Macintosh version of a compressed file.

    .swp Temporary swap files for Windows.

    .sys Windows system files.

    .tmp Temporary files used by Windows.

    .ttf True Type Fonts

    .txt Text files created by a word processing program or Windows Notepad.

    .wav Sound files that are commonly associated with Windows Media Player.

    .win Backup files for the actual Windows operating system. Not to be confused with with .bak which are backup files for Windows application programs.

    .xls Microsoft Excel document file

    .z Unix compressed file.

    .zip Files that have been compressed by a program such as WinZip or PKZip

    Thanks to for the list


  2. #2
    Where you see the "hide all known file extensions"
    un-check that box. That's how viruses are able to hide.
    You may think it's a zip file when it could be an exe.


  3. #3
    Old-Fogey:Addicts founder Terr's Avatar
    Join Date
    Aug 2001
    Seattle, WA
    You know, I love extensions. I think they are a terrific idea. (Not being able to easily see which ones are by default associated with which programs is not.)

    Anyway, I know what has always frustrated me on *nix boxes is the fact that it's sometimes a pain to tell what that file is, what it does, what program opens it, etc... even using "ls --color". In the area of extensions, I salute DOS.
    [HvC]Terr: L33T Technical Proficiency

  4. #4
    Senior Member
    Join Date
    Jan 2002
    Correct me if i am wrong, I know someone will, but if a file is labelled "file.vbs.wav" or "file.exe.mp3" then if you dont have file extensions showing, might it appear to be a wav or mp3 file, but infact could well be a worm / virii infected file?

  5. #5
    Senior Member
    Join Date
    Oct 2001
    Helsinki, Finland
    Originally posted by the_g_nee
    Correct me if i am wrong, I know someone will, but if a file is labelled "file.vbs.wav" or "file.exe.mp3" then if you dont have file extensions showing, might it appear to be a wav or mp3 file, but infact could well be a worm / virii infected file?
    Actually just vice versa... "file.exe.mp3" is an mp3-file, so it's pretty harmless as well as "file.vbs.wav" is also a harmless wav-file. But if the file is named "file.mp3.vbs", it's an executing script which can contain a virus. This is what Remote_Access_ meant with his post, the first thing you do when arriving a Windows box is to toggle "Hide all known file extensions" off - go to View | Options | [Probably-the-2nd-tab] to see that option. This makes "file.mp3.vbs" to show as "file.mp3.vbs", not "file.mp3" as it otherwise would.

    Q: Why do computer scientists confuse Christmas and Halloween?
    A: Because Oct 31 = Dec 25

  6. #6
    Blast From the Past
    Join Date
    Jan 2003
    this isnt much of a resopnse but if there is an extension that u dont know go to they should hav it
    work it harder, make it better, do it faster, makes us stronger

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