Create desktop shortcut, detect various error conditions to fail installation, and only install VCRedist if it's not already present

wix/Moonlight/Product.wxs

@@ -1,10 +1,17 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
+<?define ShortName = "Moonlight" ?>
+<?define FullName = "Moonlight Game Streaming Client" ?>
+
+<?define ShortcutName = "$(var.ShortName)" ?>
+<?define ShortcutDesc = "Stream games from a NVIDIA GameStream-compatible PC" ?>
+<?define InstallFolder = "Moonlight Game Streaming" ?>
+
 <Wix xmlns="http://schemas.microsoft.com/wix/2006/wi"
      xmlns:fire="http://schemas.microsoft.com/wix/FirewallExtension">
 
   <Product Id="*"
-           Name="Moonlight Game Streaming"
+           Name="$(var.FullName)"
            Language="1033"
            Version="!(bind.fileVersion.MoonlightExe)"
            Manufacturer="Moonlight Game Streaming Team"
@@ -22,11 +29,12 @@
     <?endif ?>
 
     <Directory Id="TARGETDIR" Name="SourceDir">
+      <Directory Id="DesktopFolder" />
       <Directory Id="$(var.PlatformProgramFilesFolder)">
-        <Directory Id="INSTALLFOLDER" Name="Moonlight Game Streaming" />
+        <Directory Id="INSTALLFOLDER" Name="$(var.InstallFolder)" />
       </Directory>
       <Directory Id="ProgramMenuFolder">
-        <Directory Id="ApplicationProgramsFolder" Name="Moonlight Game Streaming" />
+        <Directory Id="ApplicationProgramsFolder" Name="$(var.InstallFolder)" />
       </Directory>
     </Directory>
 
@@ -42,31 +50,37 @@
       <Custom Action="DeleteRegistryKey" Before="InstallFinalize">Installed AND REMOVE~="ALL" AND NOT UPGRADINGPRODUCTCODE</Custom>
     </InstallExecuteSequence>
 
-    <DirectoryRef Id="ApplicationProgramsFolder">
-      <Component Id="MoonlightShortcut" Guid="*">
-        <Shortcut Id="MoonlightStartMenuShortcut" 
-                  Name="Moonlight"
-                  Description="Stream games from a NVIDIA GameStream-compatible PC"
+    <Component Id="MoonlightShortcuts" Guid="*" Directory="INSTALLFOLDER">
+      <Shortcut Id="StartMenuShortcut" 
+                Name="$(var.ShortcutName)"
+                Description="$(var.ShortcutDesc)"
                 Target="[#MoonlightExe]"
-                  WorkingDirectory="APPLICATIONROOTDIRECTORY" />
-        <RemoveFolder Id="CleanupMoonlightShortcut" Directory="ApplicationProgramsFolder" On="uninstall" />
+                Directory="ApplicationProgramsFolder"
+                WorkingDirectory="INSTALLFOLDER" />
+      <Shortcut Id="DesktopShortcut"
+                Name="$(var.ShortcutName)"
+                Description="$(var.ShortcutDesc)"
+                Target="[#MoonlightExe]"
+                Directory="DesktopFolder"
+                WorkingDirectory="INSTALLFOLDER" />
+      <RemoveFolder Id="CleanupStartMenuShortcut" Directory="ApplicationProgramsFolder" On="uninstall" />
+      <RemoveFolder Id="CleanupDesktopShortcut" Directory="DesktopFolder" On="uninstall" />
       <RegistryValue Root="HKCU" Key="Software\Moonlight Game Streaming Project" Name="Installed" Type="integer" Value="1" KeyPath="yes" />
     </Component>
-    </DirectoryRef>
 
     <DirectoryRef Id="INSTALLFOLDER">
       <Component Id="Moonlight" Guid="*">
         <File Id="MoonlightExe" KeyPath="yes" Checksum="yes" Source="$(var.SourceDir)\Moonlight.exe">
           <fire:FirewallException Id="MoonlightFirewallException"
                                   Scope="any"
-                                  Name="Moonlight Game Streaming Client" />
+                                  Name="$(var.FullName)" />
         </File>
       </Component>
     </DirectoryRef>
 
     <Feature Id="ProductFeature" Title="Moonlight" Level="1" ConfigurableDirectory="INSTALLFOLDER">
       <ComponentRef Id="Moonlight" />
-      <ComponentRef Id="MoonlightShortcut" />
+      <ComponentRef Id="MoonlightShortcuts" />
       <ComponentGroupRef Id="MoonlightDependencies" />
     </Feature>
   </Product>

wix/MoonlightSetup/Bundle.wxs

@@ -1,7 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
 <Wix xmlns="http://schemas.microsoft.com/wix/2006/wi"
-     xmlns:bal="http://schemas.microsoft.com/wix/BalExtension">
+     xmlns:bal="http://schemas.microsoft.com/wix/BalExtension"
+     xmlns:util="http://schemas.microsoft.com/wix/UtilExtension">
 
   <Bundle Name="Moonlight Game Streaming Client"
           Version="!(bind.PackageVersion.Moonlight)"
@@ -12,7 +13,36 @@
           DisableModify="yes"
           IconSourceFile="..\..\app\moonlight.ico">
 
-    <Variable Name="InstallFolder" Type="string" Value="[ProgramFilesFolder]Moonlight Game Streaming\" />
+    <bal:Condition Message="Moonlight requires Windows 7 or later.">
+      <![CDATA[VersionNT >= v6.1]]>
+    </bal:Condition>
+
+    <!-- https://stackoverflow.com/questions/46637094/how-can-i-find-the-upgrade-code-for-an-installed-msi-file -->
+    <?if $(env.ARCH) ~= x86 ?>
+      <util:ProductSearch Id="Find_VCRedist_x86"
+                          UpgradeCode="{C78B8E51-0C65-377E-85D1-282F689FE505}"
+                          Result="state"
+                          Variable="VCRedist_Present" />
+    <?elseif $(env.ARCH) ~= x64 ?>
+      <util:ProductSearch Id="Find_VCRedist_x64"
+                          UpgradeCode="{9B0BAA88-E15F-3A1F-ACC0-B206E9DDF71C}"
+                          Result="state"
+                          Variable="VCRedist_Present" />
+    <?else ?>
+      <?error Bad ARCH value ?>
+    <?endif ?>
+
+    <?if $(env.ARCH) ~= x64 ?>
+      <bal:Condition Message="This Moonlight installer requires a 64-bit OS.">
+        VersionNT64
+      </bal:Condition>
+    <?endif ?>
+
+    <?if $(env.ARCH) ~= x64 ?>
+      <Variable Name="InstallFolder" Type="string" Value="[ProgramFiles64Folder]Moonlight Game Streaming" />
+    <?elseif $(env.ARCH) ~= x86 ?>
+      <Variable Name="InstallFolder" Type="string" Value="[ProgramFilesFolder]Moonlight Game Streaming" />
+    <?endif ?>
 
     <BootstrapperApplicationRef Id="WixStandardBootstrapperApplication.RtfLicense">
       <bal:WixStandardBootstrapperApplication
@@ -20,13 +50,14 @@
         LicenseFile="license.rtf"
         LogoFile="..\..\app\moonlight_wix.png"
         ShowFilesInUse="yes"
-        LaunchTarget="[InstallFolder]Moonlight.exe" />
+        LaunchTarget="[InstallFolder]\Moonlight.exe" />
     </BootstrapperApplicationRef>
 
     <Chain>
       <ExePackage Cache="no"
                   PerMachine="yes"
                   Permanent="yes"
+                  InstallCondition="VCRedist_Present = 2"
                   Vital="yes"
                   Compressed="yes"
                   SourceFile="$(env.VCREDIST_INSTALLER)"

wix/MoonlightSetup/MoonlightSetup.wixproj

@@ -22,6 +22,10 @@
       <HintPath>$(WixExtDir)\WixBalExtension.dll</HintPath>
       <Name>WixBalExtension</Name>
     </WixExtension>
+    <WixExtension Include="WixUtilExtension">
+      <HintPath>$(WixExtDir)\WixUtilExtension.dll</HintPath>
+      <Name>WixUtilExtension</Name>
+    </WixExtension>
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\Moonlight\Moonlight.wixproj">