Example autounattend file which can be used with Windows Server 2025 preview.

autounattend_2025_standard_preview.xml

<?xml version="1.0" encoding="utf-8"?>
<unattend xmlns="urn:schemas-microsoft-com:unattend">
    <settings pass="windowsPE">
        <component xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" name="Microsoft-Windows-International-Core-WinPE" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS">
        <!-- https://docs.microsoft.com/en-us/windows-hardware/customize/desktop/unattend/microsoft-windows-international-core-winpe -->
            <SetupUILanguage>
                <UILanguage>en-US</UILanguage>
            </SetupUILanguage>
            <InputLocale>en-US</InputLocale>
            <SystemLocale>en-US</SystemLocale>
            <UILanguage>en-US</UILanguage>
            <UILanguageFallback>en-US</UILanguageFallback>
            <UserLocale>en-US</UserLocale>
        </component>
        <component xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" name="Microsoft-Windows-Setup" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS">
        <!-- https://docs.microsoft.com/en-us/windows-hardware/customize/desktop/unattend/microsoft-windows-setup -->
            <DiskConfiguration>
            <!-- https://docs.microsoft.com/en-us/windows-hardware/customize/desktop/unattend/microsoft-windows-setup-diskconfiguration -->
            <!-- https://docs.microsoft.com/en-us/windows-hardware/customize/desktop/unattend/microsoft-windows-setup-diskconfiguration-disk-modifypartitions-modifypartition-typeid -->
                <Disk wcm:action="add">
                    <CreatePartitions>
                        <!-- Windows RE Tools partition -->
                        <CreatePartition wcm:action="add">
                            <Order>1</Order>
                            <Type>Primary</Type>
                            <Size>499</Size>
                        </CreatePartition>
                        <!-- System partition (ESP) -->
                        <CreatePartition wcm:action="add">
                            <Order>2</Order>
                            <Type>EFI</Type>
                            <Size>280</Size>
                        </CreatePartition>
                        <!-- Microsoft reserved partition (MSR) -->
                        <CreatePartition wcm:action="add">
                            <Order>3</Order>
                            <Type>MSR</Type>
                            <Size>128</Size>
                        </CreatePartition>
                        <!-- Windows partition -->
                        <CreatePartition wcm:action="add">
                            <Order>4</Order>
                            <Type>Primary</Type>
                            <Extend>true</Extend>
                        </CreatePartition>
                    </CreatePartitions>
                    <ModifyPartitions>
                        <!-- Windows RE Tools partition -->
                        <ModifyPartition wcm:action="add">
                            <Order>1</Order>
                            <PartitionID>1</PartitionID>
                            <Label>Recovery</Label>
                            <Format>NTFS</Format>
                            <TypeID>de94bba4-06d1-4d40-a16a-bfd50179d6ac</TypeID>
                        </ModifyPartition>
                        <!-- System partition (ESP) -->
                        <ModifyPartition wcm:action="add">
                            <Order>2</Order>
                            <PartitionID>2</PartitionID>
                            <Label>System</Label>
                            <Format>FAT32</Format>
                        </ModifyPartition>
                        <!-- MSR partition does not need to be modified -->
                        <ModifyPartition wcm:action="add">
                            <Order>3</Order> 
                            <PartitionID>3</PartitionID>
                        </ModifyPartition>
                        <!-- Windows partition -->
                        <ModifyPartition wcm:action="add">
                            <Order>4</Order>
                            <PartitionID>4</PartitionID>
                            <Label>Windows</Label>
                            <Format>NTFS</Format>
                            <Letter>C</Letter>
                        </ModifyPartition>
                    </ModifyPartitions>
                    <DiskID>0</DiskID>
                    <WillWipeDisk>true</WillWipeDisk>
                </Disk>
            </DiskConfiguration>
            <ImageInstall>
                <OSImage>
                    <InstallFrom>
                    <!-- https://docs.microsoft.com/en-us/windows-hardware/customize/desktop/unattend/microsoft-windows-setup-imageinstall-dataimage-installfrom-metadata-key -->
                    <!-- Get-WindowsImage -ImagePath D:\sources\install.wim -->
                        <MetaData wcm:action="add">
                            <Key>/IMAGE/INDEX </Key>
                            <Value>2</Value>
                        </MetaData>
                    </InstallFrom>
                    <InstallTo>
                        <DiskID>0</DiskID>
                        <PartitionID>4</PartitionID>
                    </InstallTo>
                </OSImage>
            </ImageInstall>
            <UserData>
                <!-- Product Key from http://technet.microsoft.com/en-us/library/jj612867.aspx -->
                <ProductKey>
                    <!-- Do not uncomment the Key element if you are using trial ISOs -->
                    <!-- You must uncomment the Key element (and optionally insert your own key) if you are using retail or volume license ISOs -->
                    <Key>MFY9F-XBN2F-TYFMP-CCV49-RMYVH</Key>
                    <WillShowUI>OnError</WillShowUI>
                </ProductKey>
                <AcceptEula>true</AcceptEula>
                <FullName>Packer</FullName>
                <Organization>Packer</Organization>
            </UserData>
        </component>
    </settings>
    <settings pass="generalize">
        <component  xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" name="Microsoft-Windows-Security-SPP" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS">
            <SkipRearm>1</SkipRearm>
        </component>
        <component xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" name="Microsoft-Windows-PnpSysprep" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS" >
            <PersistAllDeviceInstalls>false</PersistAllDeviceInstalls>
            <DoNotCleanUpNonPresentDevices>false</DoNotCleanUpNonPresentDevices>
        </component>
    </settings>
    <settings pass="specialize">
        <component xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" name="Microsoft-Windows-International-Core" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS">
        <!-- https://docs.microsoft.com/en-us/windows-hardware/customize/desktop/unattend/microsoft-windows-international-core -->
            <InputLocale>en-US</InputLocale>
            <SystemLocale>en-US</SystemLocale>
            <UILanguage>en-US</UILanguage>
            <UILanguageFallback>en-US</UILanguageFallback>
            <UserLocale>en-US</UserLocale>
        </component>
        <component xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" name="Microsoft-Windows-Shell-Setup" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS">
        <!-- https://docs.microsoft.com/en-us/windows-hardware/customize/desktop/unattend/microsoft-windows-shell-setup -->
            <ComputerName>packer-win2025</ComputerName>
            <TimeZone>Central Standard Time</TimeZone>
            <ProductKey>MFY9F-XBN2F-TYFMP-CCV49-RMYVH</ProductKey>             
        </component>
        <component xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" name="Microsoft-Windows-ServerManager-SvrMgrNc" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS">
        <!-- https://docs.microsoft.com/en-us/windows-hardware/customize/desktop/unattend/microsoft-windows-servermanager-svrmgrnc -->
            <DoNotOpenServerManagerAtLogon>true</DoNotOpenServerManagerAtLogon>
        </component>
        <component xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" name="Microsoft-Windows-IE-ESC" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS">
        <!-- https://docs.microsoft.com/en-us/windows-hardware/customize/desktop/unattend/microsoft-windows-ie-esc -->
            <IEHardenAdmin>false</IEHardenAdmin>
            <IEHardenUser>true</IEHardenUser>
        </component>
        <component xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" name="Microsoft-Windows-OutOfBoxExperience" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS">
        <!-- https://docs.microsoft.com/en-us/windows-hardware/customize/desktop/unattend/microsoft-windows-outofboxexperience -->
            <DoNotOpenInitialConfigurationTasksAtLogon>true</DoNotOpenInitialConfigurationTasksAtLogon>
        </component>
        <component xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" name="Microsoft-Windows-Security-SPP-UX" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS">
        <!-- https://docs.microsoft.com/en-us/windows-hardware/customize/desktop/unattend/microsoft-windows-security-spp-ux -->
            <SkipAutoActivation>true</SkipAutoActivation>
        </component>
    </settings>
    <settings pass="oobeSystem">
       <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>
        <component xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" name="Microsoft-Windows-Shell-Setup" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS">
        <!-- https://docs.microsoft.com/en-us/windows-hardware/customize/desktop/unattend/microsoft-windows-shell-setup -->
            <AutoLogon>
                <Password>
                    <Value>packer</Value>
                    <PlainText>true</PlainText>
                </Password>
                <Enabled>true</Enabled>
                <Username>Administrator</Username>
            </AutoLogon>
            <FirstLogonCommands>
                <SynchronousCommand wcm:action="add">
                    <CommandLine>%SystemRoot%\system32\WindowsPowerShell\v1.0\powershell.exe -Command IF (!(get-childitem Cert:\LocalMachine\My\)) { New-SelfSignedCertificate -CertstoreLocation Cert:\LocalMachine\My -DnsName "WinRMCertificate"}</CommandLine>
                    <Description>Certificate for WinRM</Description>
                    <Order>1</Order>
                    <RequiresUserInput>true</RequiresUserInput>
                </SynchronousCommand>
                <SynchronousCommand wcm:action="add">
                    <CommandLine>%SystemRoot%\system32\WindowsPowerShell\v1.0\powershell.exe -Command Enable-PSRemoting -SkipNetworkProfileCheck -Force</CommandLine>
                    <Description>Enable WinRM</Description>
                    <Order>2</Order>
                    <RequiresUserInput>true</RequiresUserInput>
                </SynchronousCommand>
                <SynchronousCommand wcm:action="add">
                    <CommandLine>%SystemRoot%\system32\WindowsPowerShell\v1.0\powershell.exe -Command ($cert = gci Cert:\LocalMachine\My\) -and (New-Item -Path WSMan:\LocalHost\Listener -Transport HTTPS -Address * -CertificateThumbPrint $cert.Thumbprint -Force)</CommandLine>
                    <Description>Add HTTPS WinRM listener with previously generated certificate</Description>
                    <Order>3</Order>
                    <RequiresUserInput>true</RequiresUserInput>
                </SynchronousCommand>
                <SynchronousCommand wcm:action="add">
                    <CommandLine>%SystemRoot%\system32\WindowsPowerShell\v1.0\powershell.exe -Command IF (!(Get-NetFirewallRule | Where Name -eq 'Windows Remote Management (HTTPS-In)')) {New-NetFirewallRule -DisplayName 'Windows Remote Management (HTTPS-In)' -Name 'Windows Remote Management (HTTPS-In)' -Profile Any -LocalPort 5986 -Protocol TCP}</CommandLine>
                    <Description>Add firewall exception to TCP port 5986 for WinRM over HTTPS</Description>
                    <Order>4</Order>
                    <RequiresUserInput>true</RequiresUserInput>
                </SynchronousCommand>
                <SynchronousCommand wcm:action="add">
                    <CommandLine>%SystemRoot%\system32\WindowsPowerShell\v1.0\powershell.exe -Command Set-Item WSMan:\localhost\Service\Auth\Basic -Value $true</CommandLine>
                    <Description>Enable Basic authentication</Description>
                    <Order>5</Order>
                    <RequiresUserInput>true</RequiresUserInput>
                </SynchronousCommand>
                <SynchronousCommand wcm:action="add">
                    <CommandLine>%SystemRoot%\system32\WindowsPowerShell\v1.0\powershell.exe -Command Stop-Service WinRM</CommandLine>
                    <Description>Stop the WinRM service to allow the dism process to finish before packer executes scripts</Description>
                    <Order>6</Order>
                    <RequiresUserInput>true</RequiresUserInput>
                </SynchronousCommand>
                <SynchronousCommand wcm:action="add">
                    <CommandLine>%SystemRoot%\system32\WindowsPowerShell\v1.0\powershell.exe -Command Restart-Computer -Force</CommandLine>
                    <Order>7</Order>
                    <Description>Restart computer to apply changes</Description>
                </SynchronousCommand>
            </FirstLogonCommands>
            <OOBE>
                <HideEULAPage>true</HideEULAPage>
                <HideLocalAccountScreen>true</HideLocalAccountScreen>
                <HideOEMRegistrationScreen>true</HideOEMRegistrationScreen>
                <HideOnlineAccountScreens>true</HideOnlineAccountScreens>
                <HideWirelessSetupInOOBE>true</HideWirelessSetupInOOBE>
                <NetworkLocation>Home</NetworkLocation>
                <ProtectYourPC>1</ProtectYourPC>
            </OOBE>
            <UserAccounts>
                <AdministratorPassword>
                    <Value>packer</Value>
                    <PlainText>true</PlainText>
                </AdministratorPassword>
            </UserAccounts>
            <RegisteredOwner/>
        </component>
    </settings>
    <settings pass="offlineServicing">
        <component xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" name="Microsoft-Windows-LUA-Settings" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS">
        <!-- https://docs.microsoft.com/en-us/windows-hardware/customize/desktop/unattend/microsoft-windows-lua-settings -->
            <EnableLUA>false</EnableLUA>
        </component>
    </settings>
    <cpi:offlineImage xmlns:cpi="urn:schemas-microsoft-com:cpi" cpi:source=""/>
</unattend>