This disc contains:
4: Joseph Fraunhofer: Diffraction - (16 min., 1974)
(right-click, choose "save as")
"Disc images" (i.e. *.iso files) contain the exact data of a DVD disc. They can be used by any DVD burning software to burn a copy of the original DVD from which the image was made. After the download is complete, use your DVD burning software (i.e. Nero, Roxio, etc.) to "burn image to disc." The result will be a DVD viewable in any DVD player.