I have some legacy source code that uses the old DirectMusic API. The source code depends on the dmusici.h, dmusicc.h and dmusic.f header files as well as on other legacy directx header files. Surprisingly, the current Microsoft SDK for Windows 11 contains most of the old DirectX APIs including the header dmusicc.h with the DirectMusic API Core. But the dmusici.h and dmusicf.h header files are missing.