Uses SCRegistrySpec.wxi in the MSI setup just like SCRegistrySpec.xml in IzPack.

resources/install/build.xml

@@ -439,13 +439,15 @@
         <filter token="WIX_PRODUCT_ID" value="${wix.product.id}" />
         <filter token="WIX_UPGRADE_CODE" value="${wix.upgrade.code}" />
         <copy
-                file="${inst.resrc}/windows/installer-windows.wxs"
-                tofile="${windows.app.dir}/tmp/installer-windows.wxs"
-                filtering="yes" />
-        <copy
-                file="${inst.resrc}/windows/en-us.wxl"
-                tofile="${windows.app.dir}/tmp/en-us.wxl"
-                filtering="yes" />
+                todir="${windows.app.dir}/tmp"
+                overwrite="true"
+                filtering="yes">
+            <fileset dir="${inst.resrc}/windows">
+                <include name="en-us.wxl" />
+                <include name="installer-windows.wxs" />
+                <include name="SCRegistrySpec.wxi" />
+            </fileset>
+        </copy>
 
         <!-- Execute candle.exe -->
         <exec

resources/install/windows/SCRegistrySpec.wxi

@@ -0,0 +1,41 @@
+<?xml version="1.0" ?>
+<Include xmlns="http://schemas.microsoft.com/wix/2006/wi">
+<Fragment>
+<ComponentGroup Id="ComponentGroup_RegistryEntries">
+
+  <Component
+      Id="Component_SipRegistryEntries"
+      Directory="TARGETDIR"
+      Guid="CF88EDC2-7D07-4269-946C-B8FF917887ED">
+    <RegistryKey Action="createAndRemoveOnUninstall" Key="sip" Root="HKCR">
+      <RegistryValue Type="string" Value="URL: SIP Protocol handler" />
+      <RegistryValue Name="URL Protocol" Type="string" Value="" />
+      <RegistryValue
+          Key="DefaultIcon" Type="string" Value="[INSTALLDIR]sc-logo.ico" />
+      <RegistryValue
+          Key="shell\open\command"
+          KeyPath="yes"
+          Type="string"
+          Value='"[INSTALLDIR]run.exe" %1' />
+    </RegistryKey>
+  </Component>
+  <Component
+      Id="Component_FeedRegistryEntries"
+      Directory="TARGETDIR"
+      Guid="BDB06CF9-F840-4CD6-B8B1-C24AC9CD11AB">
+    <RegistryKey Action="createAndRemoveOnUninstall" Key="feed" Root="HKCR">
+      <RegistryValue Type="string" Value="URL: RSS Protocol handler" />
+      <RegistryValue Name="URL Protocol" Type="string" Value="" />
+      <RegistryValue
+          Key="DefaultIcon" Type="string" Value="[INSTALLDIR]sc-logo.ico" />
+      <RegistryValue
+          Key="shell\open\command"
+          KeyPath="yes"
+          Type="string"
+          Value='"[INSTALLDIR]run.exe" %1' />
+    </RegistryKey>
+  </Component>
+
+</ComponentGroup>
+</Fragment>
+</Include>

resources/install/windows/installer-windows.wxs

@@ -71,33 +71,6 @@
           Value="1" />
     </Component>
   </Directory>
-
-  <Component Id="Component_SipRegistryEntries" Guid="CF88EDC2-7D07-4269-946C-B8FF917887ED">
-    <RegistryKey Action="createAndRemoveOnUninstall" Key="sip" Root="HKCR">
-      <RegistryValue Type="string" Value="URL: SIP Protocol handler" />
-      <RegistryValue Name="URL Protocol" Type="string" Value="" />
-      <RegistryValue
-          Key="DefaultIcon" Type="string" Value="[INSTALLDIR]sc-logo.ico" />
-      <RegistryValue
-          Key="shell\open\command"
-          KeyPath="yes"
-          Type="string"
-          Value='"[INSTALLDIR]run.exe" %1' />
-    </RegistryKey>
-  </Component>
-  <Component Id="Component_FeedRegistryEntries" Guid="BDB06CF9-F840-4CD6-B8B1-C24AC9CD11AB">
-    <RegistryKey Action="createAndRemoveOnUninstall" Key="feed" Root="HKCR">
-      <RegistryValue Type="string" Value="URL: RSS Protocol handler" />
-      <RegistryValue Name="URL Protocol" Type="string" Value="" />
-      <RegistryValue
-          Key="DefaultIcon" Type="string" Value="[INSTALLDIR]sc-logo.ico" />
-      <RegistryValue
-          Key="shell\open\command"
-          KeyPath="yes"
-          Type="string"
-          Value='"[INSTALLDIR]run.exe" %1' />
-    </RegistryKey>
-  </Component>
 </Directory>
 
 <Feature Id="Universe" Level="1" Title="@APP_NAME@">
@@ -106,8 +79,7 @@
   <ComponentRef Id="Component_DesktopShortcut" />
   <ComponentRef Id="Component_StartMenuShortcut" />
 
-  <ComponentRef Id="Component_SipRegistryEntries" />
-  <ComponentRef Id="Component_FeedRegistryEntries" />
+  <ComponentGroupRef Id="ComponentGroup_RegistryEntries" />
 </Feature>
 
 <Media Id="1" Cabinet="Data1.cab" EmbedCab="yes" />
@@ -287,4 +259,6 @@
         <UIRef Id="WixUI_Common" />
     </Fragment>
 
+<?include SCRegistrySpec.wxi ?>
+
 </Wix>