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copied!<p>It looks like you've build your application using 'x32' as the target platform which makes <code>Process.Start</code> spawn a x32-bit process. And as I guess Windows 7 stores file associations for 32-bit and 64-bit applications separately.</p> <p>If you don't have COM or unmanaged 32-bit dependencies you could try building your application for 'Any' target platform instead of 'x32'.</p> <p>I investigated some further and found that ClickOnce installer creates the following open verb for any associated file extension (GUID is unique per application):</p> <pre><code>rundll32.exe dfshim.dll, ShOpenVerbExtension {dce01888-35e8-4df3-af35-cd971f520d8d} %1 </code></pre> <p>Using <a href="http://technet.microsoft.com/en-us/sysinternals/bb896645.aspx" rel="nofollow noreferrer">Process Monitor</a>, I found that the 32-bit version fails to open <code>HKCU\Software\Classes\Wow6432Node\CLSID\{dce01888-35e8-4df3-af35-cd971f520d8d}</code> registry key. (the 64-bit version successfully opens it at <code>HKCU\Software\Classes\CLSID\{dce01888-35e8-4df3-af35-cd971f520d8d}</code>.)</p> <p>So for me it is indeed a ClickOnce bug. If I were you, I would use that dirty <code>%WinDir%\system32\cmd.exe /C test.abc</code> workaround. (Which appears to work -- tried from x32 Task Manager.)</p> <p>I've added this issue to the <strike><a href="https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=521282#details" rel="nofollow noreferrer">Microsoft Connect</a></strike> (update 2013-02-13: that link is rotten).</p>

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