You develop RPC distributed applications, for all supported platforms, on the 32-bit Windows NT platform. Although the 16-bit MIDL compiler is no longer supported, you can develop 16-bit code by doing the following:
When the Win32 SDK is installed, the RPC development environment and the run-time libraries are automatically installed. For the 32-bit Windows platform, no additional installation is required.
Note See Building RPC Applications for information about various build environments.