How can WIX based installers do COM registration for both 32 and 64 bit Windows OSes?

Question

I have a long lived installer which is using RegistryValue to setup a .Net COM server. The installer is 32 bit. I would like to have the registry settings also set for 64 bi

Answer 1

You would need to write the bootstrapper yourself.

WiX doesn't support mixed 32/64-bit packages because Windows Installer doesn't support them. However, some commercial tools use a custom bootstrapper and 2 MSI files to handle a mixed installer.

Answer 2

I had the same problem with a custom Windows Shell Overlay Extension that must provide a 32-bit Dll for 32-bit Windows and a 64-bit Dll for 64-bit Windows. My 32-bit msi file would only write the registry entries to the WoW6432 node on the 64-bit system, so the shell extension didn't work.

The solution (tested with wix-3.5.2519.0 on Win7 x86 and x64):

1. Create two components, one will install only on a 32-bit System and the other one will only install on a 64-bit System.
2. Use a 'Condition' element inside each Component to check for the bitness of the operating system. I used Msix64, it might also work with VersionNT64...
3. The 64-bit Component must have the Win64 Attribute set to "yes".
4. Unfortunately this will not work successfully out of the box because light.exe throws an error (error LGHT0204 : ICE80: This package contains 64 bit component but the Template Summary Property does not contain Intel64 or x64.):
5. The solution is to run light.exe with the ICE80 check disabled (use parameter -sice:ICE80). Now the msi file will be generated and can be used on both platforms.

Example:

<Component Id="shellext_32.dll" DiskId="1" Guid="YOUR-GUID1">
    <!-- this will be installed only on a 32-bit System-->
    <Condition><![CDATA[NOT Msix64]]></Condition> 
    <!-- copy 32-bit Dll file...-->
    <File Id="blah blah... />

    <RegistryKey Id="MyShellIconOverlay" Root="HKLM"Key="SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\ShellIconOverlayIdentifiers\MyIconOverlay" Action="createAndRemoveOnUninstall">
        <RegistryValue Type="string" Value="{GUID...}" />
    </RegistryKey>
</Component>

<Component Id="shellext_64.dll" DiskId="1" Guid="YOUR-GUID2" Win64="yes">
    <!-- this will be installed only on a 64-bit System-->
    <Condition><![CDATA[Msix64]]></Condition> 
    <!-- copy 64-bit Dll file...-->
    <File Id="blah blah... />

    <!-- the following Registry Key will NOT be created inside the WoW6432 
    <RegistryKey Id="MyShellIconOverlay64" Root="HKLM" Key="SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\ShellIconOverlayIdentifiers\MyIconOverlay64" Action="createAndRemoveOnUninstall">
        <RegistryValue Type="string" Value="{GUID...}" />
    </RegistryKey>
</Component>

References:

• http://jpassing.com/2009/10/09/mixing-32-and-64-bit-components-in-a-single-msi/
• http://installing.blogspot.com/2006/04/msi-validation-in-wix.html