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What Are File Extensions?
File extensions basically let you know what type of information is contained in a particular file. For example a note pad file has the .txt extension. This means it is a text file.
Here are some other examples of file extensions.
.exe (An executable file, usually the file that starts a program.)
.pdf (Portable Document Format, is a file format created by Adobe Systems. Most office documents come in .pdf file format.)
.zip/.rar (These could be any file but they have been compressed and packed away to a smaller size. When unpacked or unzipped it will become what it was originally.)
.wav/ .mp3 (Music files)
.jpg/.gif/.bmp (Picture file formats)
To show file extensions:
1. Open any folder on your computer.
2. Choose "Tools" - "Folder Options".
3. Click the "View" tab.
4. Uncheck "Hide extensions for known file types".
5. Click "OK" to close the dialog box.
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