How to register file types/extensions with a WiX installer?

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Unfortunately there’s no way to do a “safe” association with Windows Installer.

We just write everything out to the registry and then have a separate component that takes over the system-wide default and is only installed if no other application has already registered itself as the default.

With Vista there’s the new “default programs” interface, again you write everything out to the registry. Here’s a complete example that we’re using in our installer. (WiX 3.0)

Update: 12 months have passed since my original answer and I have a better understanding of file associations. Rather than writing everything manually I’m now using proper ProgId definitions which improves handling for advertised packages. See the updated code posted in response to this question. 

<Component ....>
    <RegistryValue Root="HKLM" Key="SOFTWARE\AcmeFoobar\Capabilities" Name="ApplicationDescription" Value="ACME Foobar XYZ Editor" Type="string" />
    <RegistryValue Root="HKLM" Key="SOFTWARE\AcmeFoobar\Capabilities" Name="ApplicationIcon" Value="[APPLICATIONFOLDER]AcmeFoobar.exe,0" Type="string" />
    <RegistryValue Root="HKLM" Key="SOFTWARE\AcmeFoobar\Capabilities" Name="ApplicationName" Value="ACME Foobar" Type="string" />
    <RegistryValue Root="HKLM" Key="SOFTWARE\AcmeFoobar\Capabilities\DefaultIcon" Value="[APPLICATIONFOLDER]AcmeFoobar.exe,1" Type="string" />
    <RegistryValue Root="HKLM" Key="SOFTWARE\AcmeFoobar\Capabilities\FileAssociations" Name=".xyz" Value="AcmeFoobar.Document" Type="string" />
    <RegistryValue Root="HKLM" Key="SOFTWARE\AcmeFoobar\Capabilities\MIMEAssociations" Name="application/xyz" Value="AcmeFoobar.Document" Type="string" />
    <RegistryValue Root="HKLM" Key="SOFTWARE\AcmeFoobar\Capabilities\shell\Open\command" Value="&quot;[APPLICATIONFOLDER]AcmeFoobar.exe&quot; &quot;%1&quot;" Type="string" />

    <RegistryValue Root="HKLM" Key="SOFTWARE\RegisteredApplications" Name="Acme Foobar" Value="SOFTWARE\AcmeFoobar\Capabilities" Type="string" />

    <RegistryValue Root="HKLM" Key="SOFTWARE\Classes\.xyz" Name="Content Type" Value="application/xyz" Type="string" />
    <RegistryValue Root="HKLM" Key="SOFTWARE\Classes\.xyz\AcmeFoobar.Document\ShellNew" Value="" Type="string" />
    <RegistryValue Root="HKLM" Key="SOFTWARE\Classes\.xyz\OpenWithList\AcmeFoobar.exe" Value="" Type="string" />
    <RegistryValue Root="HKLM" Key="SOFTWARE\Classes\.xyz\OpenWithProgids" Name="AcmeFoobar.Document" Value="" Type="string" />
    <RegistryValue Root="HKLM" Key="SOFTWARE\Classes\Applications\AcmeFoobar.exe\SupportedTypes" Name=".xyz" Value="" Type="string" />
    <RegistryValue Root="HKLM" Key="SOFTWARE\Classes\Applications\AcmeFoobar.exe\shell\open" Name="FriendlyAppName" Value="ACME Foobar" Type="string" />

    <RegistryValue Root="HKLM" Key="SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\AcmeFoobar.exe" Value="[!AcmeFoobar.exe]" Type="string" />
    <RegistryValue Root="HKLM" Key="SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\AcmeFoobar.exe" Name="Path" Value="[APPLICATIONFOLDER]" Type="string" />

    <RegistryValue Root="HKLM" Key="SOFTWARE\Classes\SystemFileAssociations\.xyz\shell\edit.AcmeFoobar.exe" Value="Edit with ACME Foobar" Type="string" />
    <RegistryValue Root="HKLM" Key="SOFTWARE\Classes\SystemFileAssociations\.xyz\shell\edit.AcmeFoobar.exe\command" Value="&quot;[APPLICATIONFOLDER]AcmeFoobar.exe&quot; &quot;%1&quot;" Type="string" />

</Component>



<Component ....>
    <ProgId Id="AcmeFoobar.Document" Description="ACME XYZ Document">
        <Extension Id="pdf" ContentType="application/xyz">
            <Verb Id="open" Command="Open" TargetFile="[APPLICATIONFOLDER]AcmeFoobar.exe" Argument="%1" />
        </Extension>
    </ProgId>

    <Condition><![CDATA[DEFAULTVIEWER=1]]></Condition>
</Component>

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