Thank you all for your effort in filling the gaps between official Delphi release and Platform SDK/Windows SDK. For developing IME, I'm looking for the APIs and Interfaces defined in msctf.h header file that comes with Platform SDK, but failed to find any.
I wish I could contribute to your project by doing the job myself, but I don't have the necessary efficiency or expertise in C.
I'm not sure whether attaching the file here would violate copyright, so I'll avoid doing that. If you guys are kind enough to plan to do this hard work, please do so from Windows 8 SDK, Microsoft seems to bring major changes in IME implementation in this version.
Thanks and keep it up!