newb question: how to create registry entries with embedded spaces

[fng2]

sorry if this has been discussed before, I have been googling for 2 days with no luck!
I have an addin for word that I made with visual studio and wix, when I compile a debug version it successfully registers it and the addin loads automatically. The export from the registry looks like this:

Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\Word\Addins\IELaddin]
"Description"="IELaddin"
"FriendlyName"="IELaddin"
"LoadBehavior"=dword:00000003
"Manifest"="file:///C:/Users/leetsp/Documents/Visual Studio 2015/Projects/IELaddin/IELaddin/bin/Debug/IELaddin.vsto|vstolocal"

however when I create the MSI installer I need to add a section in the .wxs file to create this registry entry. I have it partially working but what is giving me trouble is the spaces in the value for "manifest". you can see the commented out failures in my code snippet below.
can anyone tell me how to do this?
Thanks for any help!

my failed attempts look like this:

<!--<?define test=APPLICATIONFOLDER?>-->
 <DirectoryRef Id="TARGETDIR">
      <Component Id="RegistryEntries" Guid="{6F0E9E27-234B-4f84-B4C4-41741F906EF8}">
        <RegistryKey Root="HKCU"
                     Key="SOFTWARE\Microsoft\Office\Word\Addins\IELaddin"
              Action="createAndRemoveOnUninstall">
          <RegistryValue Type="integer" Name="LoadBehavior" Value="00000003"/>
          <RegistryValue Type="string" Name="Description" Value="addin for IEL reports"/>
          <RegistryValue Type="string" Name="FriendlyName" Value="IELaddin"/>
          <!--<RegistryValue Type="string" Name="Manifest" Value="$(var.IELaddin.TargetDir)/IELaddin.vsto|vstolocal"/>-->
          <!--<RegistryValue Type="string" Name="Manifest" Value="file:///C:\\Program&#x20Files&#x20(x86)\\IEL&#x20addin\\IELaddin.vsto|vstolocal"/>-->
          <!--<RegistryValue Type="string" Name="Manifest" Value="$(var.IELaddin.APPLICATIONFOLDER)\IELaddin.vsto|vstolocal"/>-->
          <!--<RegistryValue Type="string" Name="Manifest" Value="$(var.test)/IELaddin.vsto|vstolocal"/>-->
        </RegistryKey>
      </Component>
    </DirectoryRef>