Definition of file extension in English:

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file extension


A group of letters occurring after a period in a file name, indicating the format of the file.
Example sentences
  • This is done by viewing the file extension in the email attachment.
  • The protocol name is simply the filename, excluding any file extension.
  • Have you ever gotten an e-mail from a friend with a file extension you may not be familiar with?

For editors and proofreaders

Syllabification: file ex·ten·sion

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