You can obtain an update for the Windows Update Agent (WUA) API header files from the following locations in the Microsoft Download Center. For more information about how to update WUA, see Updating Windows Update Agent.

Readme

http://download.microsoft.com/download/a/2/f/a2fd4046-57cb-4bdf-9b68-9b35cf0dfe56/Windows Update Agent Header Files Readme.mht

Download i386 header files.

http://download.microsoft.com/download/c/b/c/cbc71c4b-d2c4-4f37-a1b0-6ed744e45c8a/wua_api_headers_i386.EXE

Download ia64bit header files.

http://download.microsoft.com/download/b/3/e/b3ee3e33-a414-4f03-95dc-63e154f7ba7a/wua_api_headers_ia64.EXE

Download x64bit header files.

http://download.microsoft.com/download/7/3/0/730911e6-ce37-428c-ab04-efbdccea3177/wua_api_headers_x64.EXE

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Build date: 3/9/2009