Short for Microsoft CD-ROM Extension, a driver that enables DOS and Windows 3.x systems to recognize and control CD-ROM players. The driver is located in a file called MSCDEX.EXE. Windows 95 replaces MSCDEX with a 32-bit, dynamically loadable driver called CDFS.
ADVERTISER DISCLOSURE: SOME OF THE PRODUCTS THAT APPEAR ON THIS SITE ARE FROM COMPANIES FROM WHICH TECHNOLOGYADVICE RECEIVES COMPENSATION. THIS COMPENSATION MAY IMPACT HOW AND WHERE PRODUCTS APPEAR ON THIS SITE INCLUDING, FOR EXAMPLE, THE ORDER IN WHICH THEY APPEAR. TECHNOLOGYADVICE DOES NOT INCLUDE ALL COMPANIES OR ALL TYPES OF PRODUCTS AVAILABLE IN THE MARKETPLACE.