The OS/2 subsystem supports OS/2 1.x character-based applications on x86-based computers. Although this subsystem isn't supported on RISC computers, OS/2 real-mode applications can run on a RISC computer in the MS-DOS environment. Bound applications (those designed to run under either OS/2 or MS-DOS) will always run in the OS/2 subsystem if one is available.
Note
Windows NT 4.0 does not support HPFS, the file system designed for OS/2 1.x operating systems. Support for this file system ends with this release.
For more information about using OS/2 1.x applications on Windows NT, see Chapter 28, "OS/2 Compatibility."