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FilledSmallSquareFileByteCount["file"] gives the number of bytes in a file.

FilledSmallSquare If a particular file is moved from one computer system to another, the number of bytes in the file as reported by FileByteCount may change.

FilledSmallSquare See The Mathematica Book: Section 2.11.6.

FilledSmallSquare See also: StringLength, FileType.

FilledSmallSquare Related package: Utilities`BinaryFiles`.