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Computers use file extensions to determine a file's type.

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Jeffry Ortiz

Lvl 10
1y ago
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Wiki User

11y ago

To tell the operating system what application to open the file with.

So a file with file.txt will be opened by notepad or equivalent, whereas file.doc will be opened by a word processing application.

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Wiki User

11y ago

Operating System uses file extensions to identify the data contained in it.. and choose preferable applications to open files

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Wiki User

9y ago

Computers use file extensions to determine a file's type.

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Q: What is the purpose of a file extension and what is a file extension?
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