The ISO file extension is used to signify disk image files based on the ISO-9660 industry standard for CD and DVD reproductions. ISO disc images is an archive file of an optical disc using a conventional ISO(International Organization Standardization) format that is supported by many software. It merges a series of files into one single file according to a definite format.
The ISO file extension is a CAD drawing file associated with PTC Arbortext IsoDraw CAD modeling tool used to create 2D technical illustrations. The ISO file contains part catalogs, service manuals and assembly instructions.