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    <p>For part 1 of your question, as long as your application is correctly registered to handle that MIME type, then, yes, the browser should [prompt the user and launch your application](<a href="http://msdn.microsoft.com/en-us/library/ms775148(VS.85).aspx" rel="nofollow noreferrer">http://msdn.microsoft.com/en-us/library/ms775148(VS.85).aspx</a> "MSDN: Handling MIME Types in Internet Explorer").</p> <p>An alternative approach would be a [protocol handler](<a href="http://msdn.microsoft.com/en-us/library/aa767914(VS.85).aspx" rel="nofollow noreferrer">http://msdn.microsoft.com/en-us/library/aa767914(VS.85).aspx</a> "MSDN: Registering an Application to a URL Protocol"). Instead of registering a MIME type for your application, you register a “protocol” that goes in a URL, in place of the <code>http://</code>. If your protocol is called <code>myapp</code>, then you could create links like this:</p> <pre><code>&lt;a href="myapp:data-goes-here-urlencoded"&gt;Link&lt;/a&gt; </code></pre> <p>While you can only pass a small amount of information this way, you could pass a GUID or tag that the application, once launched, can use to retrieve the full document from your server.</p> <p><strong>Edit:</strong> For part 2 of your question, iTunes uses a plug-in. Looking at the code that’s used to redirect to iTunes, you’ll see something like this:</p> <pre><code>&lt;Object id="iTunesDetector" height="1" classID="CLSID:D719897A-B07A-4C0C-AEA9-9B663A28DFCB" width="1"&gt;&lt;/Object&gt; </code></pre> <p>It’s followed by some JavaScript to detect whether that plug-in was loaded. If it was, then iTunes must be installed and it launches iTunes using the <code>itms:</code> protocol (just like the <code>myapp:</code> protocol in the example above).</p> <p>The problem here is, you would have to write a browser plug-in.</p>
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    1. POHow do you ask an external program to open a file being served through a web browser? What about detecting if the external program is installed?
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    1. COThanks for the answer! I think either application launching solution seems to be a good one. Now the question is how do I cover all my bases with freaking plugins for every browser known to man... might just have a cookie fallback when I serve somebody the download file until we can get all those bases covered.
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