🚀 go-pugleaf

Here's what I've read on this issue [quoting MS's internal rag]

MULTIMEDIA DEVELOPMENT KIT

On Tuesday, Microsoft Corporation announced its Multimedia Development Kit,
a set of systems software and development tools for creating multimedia titles
and applications for the Microsoft Windows multimedia environment.  These
titles and applications will run on multimedia PCs that have been enhanced
to meet the hardware specifications agreed to by major OEMs.  The kit is
now available in beta form to registered software vendors, with general
availability in the first half of 1991 and a suggested price of $500.

The Multimedia Development Kit can be used whether the developer is 
building a multimedia title from published content or adding multimedia 
components to an existing software application.  Developers use the 
Multimedia Development Kit in conjunction with a high-level authoring
tool or a standard C programming environment to built their applications.

The kit contains:
	* Multimedia content and data preparation tools to assist in such
tasks as audio manipulation, image manipulation and conversion of
audio and image formats.
	* Tools for software development (including link libraries) include
files and sample source code.
	* Extensive documentation for use by all types of developers
including: Multimedia Authoring Guide, a step-by-step guide for developing
multimedia titles from start to finish.
	* Tools Directory, a list of third-party tools available and 
explanations of how they are used.
	* Data Preparation Tools User's Guide, a guide to using the data
preparation tools.
	* Multimedia Programmer's Workbook, a multimedia programming 
overview explaining the architecture of a multimedia title.
	* Multimedia Programmer's Reference, a guide that provides detailed
explanations of the multimedia APIs.

un-quote.

Hope this helps [I'm not a multimedia guy, just a fellow Windows developer.
I'd say contact MS through your usual SDK channels for more detailed questions]