Add or Remove Programs entry for Microsoft Speech SDK 4.0 ActiveX Components. Microsoft Speech SDK is a software development kit for building speech engines and applications for Microsoft Windows. Designed primarily for the desktop speech developer, the SDK contains the Microsoft® Win32®-compatible speech application programming interface (SAPI), sample application that demonstrates the use of Speech with other engine technologies, and documentation on the most important SDK functionalities. This adds the ActiveX Component functionality to the SDK.