Did you know that when you save a file the computer adds a three letter extension to the name you give the file.
The extensions tell the computer what program to use to open a file.
These are some common file extensions:
Extension Program that opens it
.doc Microsoft Word
.xls Microsoft Excel
.pub Microsoft Publisher
.ppt Microsoft PowerPoint
Some file extensions used on the internet tell you what kind of file something is:
Extensions What it probably is
.htm A Web Page
.gif A Graphic or Animation
.jpg A Photo or Image
.png A Photo or Image.
.mpg A Movie or Animation
.pdf A Portable Document File
.mp3 A Sound or Music File
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