Have you ever attempted to open a file on your computer - a file you created yourself or one received from a friend - and get a message like this?

Every file on your computer has what is called an extension - usually a 2, 3, or 4 character sequence that is used to relate the file to a specific software application. The example, above, is shown having an extension of ".flv". As you install software applications and create files on your system, it manages the relationships between those applications and files.

Examples of file extensions include the following:

• .txt
• .doc
• .xls
• .htm or .html
• .mpeg or .mpg
• .qt
• .wav
• .mp3
• .qw6
• .wpd

When you attempt to open a file whose extension is not associated with a specific software application, a dialog box will appear (like the one posted above). At this point, you're presented with two options. You can either:

• Be directed to a Microsoft website that provides more information about the file you're attempting to open
  
  
  OR
  
  
• If you know what program is needed to open the file and you know that it's already on your computer, you can select the second option and indicate which program that is.

If you're simply interested in learning more about various file extensions, you can visit a site such as www.filext.com. At www.filext.com, you can enter a file extension to search for related software applications, review an alphabetical list of file extensions, participate in online discussions, or submit an extension that you didn't find in their database.

All-in-all, you don't need to be befuddled about files that don't open. Resources, such as the directions and website posted above, are readily available to help you figure out what to do.

Did you find this information helpful? I certainly hope so and would love to hear from you. Send your questions and/or comments to editor@lakeshoreguardian.com.