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    <p>There is a superb answer to this question <a href="https://stackoverflow.com/questions/2774343/how-do-i-associate-file-types-with-an-iphone-application/2781290#2781290">here</a>. I've copied some of the answer below for clarity, but you should refer to that question for the complete answer. </p> <p>File type handling is new with iPhone OS 3.2, and is different than the already-existing custom URL schemes. You can register your application to handle particular document types, and any application that uses a document controller can hand off processing of these documents to your own application.</p> <p>To register support, you will need to have something like the following in your Info.plist:</p> <pre><code>&lt;key&gt;CFBundleDocumentTypes&lt;/key&gt; &lt;array&gt; &lt;dict&gt; &lt;key&gt;CFBundleTypeIconFiles&lt;/key&gt; &lt;array&gt; &lt;string&gt;Document-molecules-320.png&lt;/string&gt; &lt;string&gt;Document-molecules-64.png&lt;/string&gt; &lt;/array&gt; &lt;key&gt;CFBundleTypeName&lt;/key&gt; &lt;string&gt;Molecules Structure File&lt;/string&gt; &lt;key&gt;CFBundleTypeRole&lt;/key&gt; &lt;string&gt;Viewer&lt;/string&gt; &lt;key&gt;LSHandlerRank&lt;/key&gt; &lt;string&gt;Owner&lt;/string&gt; &lt;key&gt;LSItemContentTypes&lt;/key&gt; &lt;array&gt; &lt;string&gt;com.sunsetlakesoftware.molecules.pdb&lt;/string&gt; &lt;string&gt;org.gnu.gnu-zip-archive&lt;/string&gt; &lt;/array&gt; &lt;/dict&gt; &lt;/array&gt; </code></pre> <p>One of the UTIs used in the above example was system-defined, but the other was an application-specific UTI. The application-specific UTI will need to be exported so that other applications on the system can be made aware of it. To do this, you would add a section to your Info.plist like the following:</p> <pre><code>&lt;key&gt;UTExportedTypeDeclarations&lt;/key&gt; &lt;array&gt; &lt;dict&gt; &lt;key&gt;UTTypeConformsTo&lt;/key&gt; &lt;array&gt; &lt;string&gt;public.plain-text&lt;/string&gt; &lt;string&gt;public.text&lt;/string&gt; &lt;/array&gt; &lt;key&gt;UTTypeDescription&lt;/key&gt; &lt;string&gt;Molecules Structure File&lt;/string&gt; &lt;key&gt;UTTypeIdentifier&lt;/key&gt; &lt;string&gt;com.sunsetlakesoftware.molecules.pdb&lt;/string&gt; &lt;key&gt;UTTypeTagSpecification&lt;/key&gt; &lt;dict&gt; &lt;key&gt;public.filename-extension&lt;/key&gt; &lt;string&gt;pdb&lt;/string&gt; &lt;key&gt;public.mime-type&lt;/key&gt; &lt;string&gt;chemical/x-pdb&lt;/string&gt; &lt;/dict&gt; &lt;/dict&gt; &lt;/array&gt; </code></pre> <p>This particular example exports the <code>com.sunsetlakesoftware.molecules.pdb</code> UTI with the .pdb file extension, corresponding to the MIME type <code>chemical/x-pdb</code>.</p> <p>With this in place, your application will be able to handle documents attached to emails or from other applications on the system. In Mail, you can tap-and-hold to bring up a list of applications that can open a particular attachment.</p> <p>When the attachment is opened, your application will be started and you will need to handle the processing of this file in your <code>-application:didFinishLaunchingWithOptions:</code> application delegate method. It appears that files loaded in this manner from Mail are copied into your application's Documents directory under a subdirectory corresponding to what email box they arrived in.</p>
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