RPC Extensions (Rpcexts.dll)
Extension commands that are useful for debugging Microsoft Remote Procedure Call (RPC) can be found in Rpcexts.dll.
The Windows 2000 version of this extension DLL appears in the w2kfre and w2kchk directories. The Windows XP and later version of this extension DLL appear in the winxp directory.
For more information about how to use these extensions, see Using the RPC Debugger Extensions.