File extensions

File extensions :

Say someone sends you a file attached to an e-mail. The file will have a name
and an extension. File extensions basically let you know what type of information is contained in a
particular file. For example a Microsoft Word file has the .doc or docx extension. The .jpeg or sometimes
the .jpg is a file extension for a certain type of graphic (photo).
Here are some other examples of file extensions:

1. .exe (An executable file, usually the file that starts a program.)
2. .pdf (Portable Document Format, is a file format created by Adobe Systems. Most office
3. documents come in .pdf file format.)
4. .Doc/.docx – Microsoft Word document (if an ‘x’ is included, it’s version 2007)
5. .xls/.xlxx – Microsoft Excel workbook/worksheet (if an ‘x’ is included, it’s version 2007)
6. .ppt/.pptx – Microsoft Power Point presentation (if an ‘x’ is included, it’s version 2007)
7. .zip/.rar (These could be any file but they have been compressed and packed away to a smaller
8. size. When unpacked or unzipped it will become what it was originally.)
9. .wav/ .mp3 (music files)
10. .jpg/.gif/.bmp (Picture file formats)