QuickTime can import, export, decompress, and compress files containing DV data that conforms to the format described in the DV standards document, "Specifications of Consumer-Use Digital VCRs Using 6.3 mm Magnetic Tape" (December, 1994; revised in January, 1996). The type of a Mac OS file containing DV data must be 'dvc!' ; the file extension of a Microsoft Windows file containing DV data must be .dvc . The files can contain only the contents of a DV data stream. They cannot contain CIP headers used for IEEE 1394 (FireWire) transport, but they can include header data defined in the DV standards document.