deskflow/res/dist/wix/DeskflowWelcome.wxs

<?xml version="1.0" encoding="UTF-8"?>
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<Wix xmlns="http://schemas.microsoft.com/wix/2006/wi">
   <?include Include.wxi?>
   <Fragment>
      <UI Id="DeskflowWelcome">
         <Property Id="DeskflowWelcomeBackground">welcome_background</Property>
         <Binary Id="welcome_background" SourceFile="$(var.ResPath)\dist\wix\images\welcome_background.png"/>

         <Dialog Id="DeskflowWelcome" Width="370" Height="270" Title="!(loc.WelcomeDlg_Title)">
            <Control Id="Next" Type="PushButton" X="236" Y="243" Width="56" Height="17" Default="yes" Text="!(loc.WixUINext)">
               <Publish Property="WixUI_InstallMode" Value="Update">Installed AND PATCH</Publish>
            </Control>
            <Control Id="Cancel" Type="PushButton" X="304" Y="243" Width="56" Height="17" Cancel="yes" Text="!(loc.WixUICancel)">
               <Publish Event="SpawnDialog" Value="CancelDlg">1</Publish>
            </Control>
            <Control Id="Bitmap" Type="Bitmap" X="0" Y="0" Width="370" Height="234" TabSkip="no" Text="[DeskflowWelcomeBackground]" />
            <Control Id="Back" Type="PushButton" X="180" Y="243" Width="56" Height="17" Disabled="yes" Text="!(loc.WixUIBack)" />
            <Control Id="BottomLine" Type="Line" X="0" Y="234" Width="370" Height="0" />
         </Dialog>

         <InstallUISequence>
            <Show Dialog="DeskflowWelcome" Before="ProgressDlg" Overridable="yes">NOT Installed OR PATCH</Show>
         </InstallUISequence>
      </UI>
   </Fragment>
</Wix>