A string of characters attached to a filename, usually preceded by a full stop and indicating the format of the file.
- 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
Line breaks: file ex¦ten|sion
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