Microsoft Server 2003 Resource Kit
From WPKG | Open Source Software Deployment and Distribution
This is two-step process; thanks to REM State for the details.
First, download the Microsoft Windows Server 2003 Resource Kit from Microsoft; this is an .exe file. Next, run:
rktools.exe /T:C:\Temp\rktools /C
to extract the cab file to C:\Temp\rktools. Copy that to the repository and use this XML for the package file:
<package id='rktools2003' name='Windows Server 2003 Resource Kit' revision='1' priority='50' reboot='false' >
<!-- 7-Zip file packer -->
<check type='uninstall' condition='exists' path='Windows Resource Kit Tools' />
<install cmd='msiexec /qn /i "%SOFTWARE%\rktools\rktools.msi" RKTOOLS="C:\Program Files\Windows Resource Kit\Tools"' />
<remove cmd='msiexec /x "%SOFTWARE%\rktools\rktools.msi" /qn' />
<upgrade cmd='msiexec /i "%SOFTWARE%\rktools\rktools.msi" /qn' />
</package>