/usr/share/cmake-2.8/Modules/WIX.template.in is in cmake-data 2.8.12.2-0ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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<?include "cpack_variables.wxi"?>
<Wix xmlns="http://schemas.microsoft.com/wix/2006/wi"
    RequiredVersion="3.6.3303.0">
    <Product Id="$(var.CPACK_WIX_PRODUCT_GUID)"
        Name="$(var.CPACK_PACKAGE_NAME)"
        Language="1033"
        Version="$(var.CPACK_PACKAGE_VERSION)"
        Manufacturer="$(var.CPACK_PACKAGE_VENDOR)"
        UpgradeCode="$(var.CPACK_WIX_UPGRADE_GUID)">
        <Package InstallerVersion="301" Compressed="yes"/>
        <Media Id="1" Cabinet="media1.cab" EmbedCab="yes"/>
        <MajorUpgrade
            Schedule="afterInstallInitialize"
            AllowSameVersionUpgrades="yes"
            DowngradeErrorMessage="A later version of [ProductName] is already installed. Setup will now exit."/>
        <WixVariable Id="WixUILicenseRtf" Value="$(var.CPACK_WIX_LICENSE_RTF)"/>
        <Property Id="WIXUI_INSTALLDIR" Value="INSTALL_ROOT"/>
        <?ifdef CPACK_WIX_PRODUCT_ICON?>
        <Property Id="ARPPRODUCTICON">ProductIcon.ico</Property>
        <Icon Id="ProductIcon.ico" SourceFile="$(var.CPACK_WIX_PRODUCT_ICON)"/>
        <?endif?>
        <?ifdef CPACK_WIX_UI_BANNER?>
        <WixVariable Id="WixUIBannerBmp" Value="$(var.CPACK_WIX_UI_BANNER)"/>
        <?endif?>
        <?ifdef CPACK_WIX_UI_DIALOG?>
        <WixVariable Id="WixUIDialogBmp" Value="$(var.CPACK_WIX_UI_DIALOG)"/>
        <?endif?>
        <FeatureRef Id="ProductFeature"/>
        <UIRef Id="WixUI_InstallDir" />
    </Product>
</Wix>
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