Using EMS with a page frame, NWCDEX can reduce its footprint even down to a few bytes in conventional memory. It has more flexible load-high capabilities, also allowing to relocate and run in protected mode through DPMS on 286 and higher processors, thereby leaving only a 7 KB stub in conventional or upper memory (in comparison to MSCDEX, which occupies some 16 KB). Novell DOS 7, Caldera OpenDOS 7.01 and DR-DOS 7.02 and higher provide a functional equivalent to MSCDEX named NWCDEX, which also runs under MS-DOS and PC DOS. It is implemented as a terminate-and-stay-resident program and an extension to the redirector interface ( CDEX).ĭatalight ROM-DOS includes an implementation of MSCDEX. The driver essentially looks similar to a network drive from the system perspective. This is the reason that at least version 3.1 of MS-DOS is required. The driver uses the Microsoft networks interface in MS-DOS. Starting with Windows 95, CD-ROM access became possible through a 32-bit CDFS driver. The final version of the MSCDEX program was 2.25, included with Windows 95 and used when creating bootable floppy disks with CD-ROM support. This requires the previous loading of an appropriate CD-ROM device driver (example: OAKCDROM.SYS), usually from CONFIG.SYS. The program is a driver executable which allows DOS programs to recognize, read, and control CD-ROMs using the High Sierra and – since version 2.0 as of 1988 – also the ISO 9660 file systems. Earlier versions of MSCDEX since 1986 were installable add-ons for MS-DOS 3.1 and higher. MSCDEX or Microsoft CD-ROM Extensions is a software program produced by Microsoft and included with MS-DOS 6.x and certain versions of Windows to provide CD-ROM support.
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