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  1. Oxford Dictionary

    file extension

    • n.
      a string of characters attached to a filename, usually preceded by a full stop and indicating the format of the file.

    • noun: file extension, plural noun: file extensions

    • 更多解釋

    file extension

    • IPA[fīl ikˈsten(t)SHən]
    • n.
      a group of letters occurring after a period in a file name, indicating the format of the file.

    Oxford American Dictionary