@Sean Liming here is the file (w/ company-specific information redacted). The file already existed when I took over the project. I believe it was created with a text editor (and I know I've been using a text editor to modify it.)
<?xml version="1.0" encoding="utf-8" ?>
<unattend
xmlns="urn:schemas-microsoft-com:unattend">
<servicing></servicing>
<settings
pass="generalize">
<component
name="Microsoft-Windows-PnpSysprep"
processorArchitecture="amd64"
publicKeyToken="31bf3856ad364e35"
language="neutral"
versionScope="nonSxS"
xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<PersistAllDeviceInstalls>true</PersistAllDeviceInstalls>
</component>
</settings>
<settings
pass="specialize">
<component
name="Microsoft-Windows-Shell-Setup"
processorArchitecture="amd64"
publicKeyToken="31bf3856ad364e35"
language="neutral"
versionScope="nonSxS"
xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<RegisteredOwner>My Company</RegisteredOwner>
<ShowWindowsLive>false</ShowWindowsLive>
<TimeZone>Eastern Standard Time</TimeZone>
<RegisteredOrganization>My Company</RegisteredOrganization>
<CopyProfile>true</CopyProfile>
<ComputerName>COMPANY-PC</ComputerName>
</component>
<component
name="Microsoft-Windows-Deployment"
processorArchitecture="amd64"
publicKeyToken="31bf3856ad364e35"
language="neutral"
versionScope="nonSxS"
xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<RunSynchronous>
<RunSynchronousCommand
wcm:action="add">
<Path>net user administrator /active:yes</Path>
<Description>Enable Administrator</Description>
<Order>1</Order>
</RunSynchronousCommand>
</RunSynchronous>
</component>
<component
name="Microsoft-Windows-Security-SPP-UX"
processorArchitecture="amd64"
publicKeyToken="31bf3856ad364e35"
language="neutral"
versionScope="nonSxS"
xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<SkipAutoActivation>true</SkipAutoActivation>
</component>
</settings>
<settings
pass="oobeSystem">
<component
name="Microsoft-Windows-Shell-Setup"
processorArchitecture="amd64"
publicKeyToken="31bf3856ad364e35"
language="neutral"
versionScope="nonSxS"
xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<OOBE>
<HideEULAPage>true</HideEULAPage>
<HideWirelessSetupInOOBE>true</HideWirelessSetupInOOBE>
<HideLocalAccountScreen>true</HideLocalAccountScreen>
<HideOEMRegistrationScreen>true</HideOEMRegistrationScreen>
<HideOnlineAccountScreens>true</HideOnlineAccountScreens>
<NetworkLocation>Work</NetworkLocation>
<SkipMachineOOBE>true</SkipMachineOOBE>
<SkipUserOOBE>true</SkipUserOOBE>
<UnattendEnableRetailDemo>false</UnattendEnableRetailDemo>
</OOBE>
<RegisteredOwner>My Company</RegisteredOwner>
<ShowWindowsLive>false</ShowWindowsLive>
<RegisteredOrganization>My Company</RegisteredOrganization>
</component>
<component
name="Microsoft-Windows-International-Core"
processorArchitecture="amd64"
publicKeyToken="31bf3856ad364e35"
language="neutral"
versionScope="nonSxS"
xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<InputLocale>en-US</InputLocale>
<SystemLocale>en-US</SystemLocale>
<UILanguage>en-US</UILanguage>
<UILanguageFallback>en-US</UILanguageFallback>
<UserLocale>en-US</UserLocale>
</component>
</settings>
<settings
pass="windowsPE">
<component
name="Microsoft-Windows-Setup"
processorArchitecture="amd64"
publicKeyToken="31bf3856ad364e35"
language="neutral"
versionScope="nonSxS"
xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<UserData>
<AcceptEula>true</AcceptEula>
</UserData>
</component>
</settings>
</unattend>