Did you know that when you save a file the computer automatically adds a period and three letters to the end of the name you give the file. In the old days, before the Windows operating system, file names used to look like this:
Technically speaking, file extensions like: .exe, .bmp, and .log are still being used by your computer. However they might not always be displayed with the file name. They are still important because they tell the computer what program to use to open a file. Below are some common Microsoft file extensions that you might see and the programs that opens them. Notice that the newer versions of the programs all hav an "x" added to the file extension to differentiate them from the older files.
| Extension | Program that opens it |
| .doc | Microsoft Word 2003 or older |
| .docx | Microsoft Word 2010 or newer |
| .xls | Microsoft Excel 2003 or older |
| .xlsx | Microsoft Excel 2010 or newer |
| .pub | Microsoft Publisher 2003 or older |
| .pubx | Microsoft Publisher 2010 or newer |
| .ppt | Microsoft PowerPoint 2003 or older |
| .pptx | Microsoft PowerPoint 2010 or newer |
Some file extensions, especially the ones used on the internet, tell you what kind of file something is. Here are some examples:
| Extension | What it probably is |
| .htm | A web page |
| .gif | A graphic or animation |
| .jpg | A photograph or image |
| .png | A photograph or image |
| .mpg | A movie or animation |
| A portable document file (Adobe) | |
| .mp3 | A sound or music file |
| .mp4 | A movie or animation |
If you'd like to see even more file extensions here's a website that claims to list "every file extension in the world"
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