Released in late December 1993 PC-DOS 6.3 had quite a number of minor fixes to many of its executable files over version 6.1, most notably some major improvements to the SuperStor disk compression program. PC DOS 6.3 also added support for more tape backup drives, enhanced PC-Card support for laptops, especially IBM's own ThinkPads, and more features were added to the editor.

It became very popular with OEMs because Microsoft had stopped stand-alone, non-Windows releases of MS-DOS at their version 6.22.

Next major release of PC DOS 7.0 came in May 1995