Actually, that's for MFC*, and the release notes on the site says to get it here:
<a href="
http://www.microsoft.com/ntworkstation/downloads/Recommended/ServicePacks/MFCLibrary.asp">
http://www.microsoft.com/ntworkstation/downloads/Recommended/ServicePacks/MFCLibrary.asp </a>
*MFC: Microsoft Foundation Classes. A set of C++ classes that makes building Windows apps easier. Basically everything seems to be derived from some other class. Could add a bit of bloat, but (as far as I can tell) isn't as bad as MSVBVM60 and others.