Wix WixBalExtension

Question

Hello 

I am a new Wix user. Here is my problem.

I need help cause i want to use in a installer bundle (.msi) a command  that i have never use.

 

<Wix xmlns="http://schemas.microsoft.com/wix/2006/wi" xmlns:bal="http://schemas.microsoft.com/wix/BalExtension">
<Bundle>
        <BootstrapperApplicationRef Id="WixStandardBootstrapperApplication.RtfLicense">
          <bal:WixStandardBootstrapperApplication
            LicenseFile="path\to\license.rtf"
            ThemeFile="path\to\customtheme.xml"
            />
        </BootstrapperApplicationRef>
      </Bundle>

 

And here is the compil batch. So without this part my programm compil with two .wks files.

candle userregistrationdlg.wxs
candle samplewixui.wxs
light -ext WixUIExtension WixBalExtension -cultures:fr-fr userregistrationdlg.wixobj samplewixui.wixobj -out Magnum.msi
 

Finaly my ask is . Where can i find this  WixBalExtension (.wxs ?) file ?

and my compil log : 

light.exe : error LGHT0144 : The extension 'WixBalExtension' could not be loaded
 because of the following reason: Impossible de charger le fichier ou l'assembly
 'file:///D:\chinoi\WixBalExtension' ou une de ses dépendances. Le fichier spéci
fié est introuvable.