Having the same DDK on my system, I cannot find the file, however you can do it with some tools or programmatically:
If you use a program that loads this DLL, you can use windbg to display information about the module (which should include the path), otherwise you can use one of the psapi functions.
After some gibbering, from this article it seems that there is no longer public msvcrtd.dll for use with WDK, this however gives some recommendations on the use of alternatives. MSDN also supports the fact that debugging CRTs no longer work, since methods for debugging include the debugging API and / or WinDBG. However, I suspect that the dll may be available from a trusted window assembly .