Windows Update EXEs And Services

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Windows' Update Executable
%windir%\\System32\\WUDFHost.exe
%windir%\\system32\\wuapp.exe startmenu

You may see commands with arguments such as
C:\\Windows\\System32\\WUDFHost.exe and %windir%\\system32\\wuapp.exe startmenu

The Windows Update service name is plain Windows Update, which will ran through C:\\Windows\\system32\\svchost.exe (the "host process for windows services").