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The file extension is the three letter file type designation following a period at the end of a file name. It determines what type of file that file will be treated as.

Changing a text (.txt) document to .wmv will make the computer treat it as a Windows Media Video file and thus it will be opened with your default program for viewing .wmv format videos.

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βˆ™ 14y ago
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Keaton Ullah

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βˆ™ 3y ago
They tell the operating system what kind of document you are creatingΒ 
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Makayla Dimas-Castil...

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βˆ™ 2y ago

They tell the operating system what kind of document you are creating

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βˆ™ 7y ago

they tell the operating system what kind of document you are creating

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Q: What is the purpose of file extension?
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