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    <p>First add the proper extensions to CFBundleDocumentTypes inside the .plist file.<br></p> <p>Next implement the following delegates:<br> - application:openFile: (one file dropped)<br> - application:openFiles: (multiple files dropped)<br></p> <p>Reference:<br> <a href="http://developer.apple.com/library/mac/#documentation/cocoa/reference/NSApplicationDelegate_Protocol/">NSApplicationDelegate Protocol Reference</a></p> <p><strong>Response to comment:</strong></p> <p>Step by step example, hopefully it makes everything clear :)</p> <p>Add to the .plist file:</p> <pre><code> &lt;key&gt;CFBundleDocumentTypes&lt;/key&gt; &lt;array&gt; &lt;dict&gt; &lt;key&gt;CFBundleTypeExtensions&lt;/key&gt; &lt;array&gt; &lt;string&gt;xml&lt;/string&gt; &lt;/array&gt; &lt;key&gt;CFBundleTypeIconFile&lt;/key&gt; &lt;string&gt;application.icns&lt;/string&gt; &lt;key&gt;CFBundleTypeMIMETypes&lt;/key&gt; &lt;array&gt; &lt;string&gt;text/xml&lt;/string&gt; &lt;/array&gt; &lt;key&gt;CFBundleTypeName&lt;/key&gt; &lt;string&gt;XML File&lt;/string&gt; &lt;key&gt;CFBundleTypeRole&lt;/key&gt; &lt;string&gt;Viewer&lt;/string&gt; &lt;key&gt;LSIsAppleDefaultForType&lt;/key&gt; &lt;true/&gt; &lt;/dict&gt; &lt;/array&gt; </code></pre> <p>Add to ...AppDelegate.h</p> <pre><code>- (BOOL)processFile:(NSString *)file; - (IBAction)openFileManually:(id)sender; </code></pre> <p>Add to ...AppDelegate.m</p> <pre><code>- (IBAction)openFileManually:(id)sender; { NSOpenPanel *openPanel = [NSOpenPanel openPanel]; NSArray *fileTypes = [NSArray arrayWithObjects:@"xml",nil]; NSInteger result = [openPanel runModalForDirectory:NSHomeDirectory() file:nil types:fileTypes ]; if(result == NSOKButton){ [self processFile:[openPanel filename]]; } } - (BOOL)application:(NSApplication *)theApplication openFile:(NSString *)filename { return [self processFile:filename]; } - (BOOL)processFile:(NSString *)file { NSLog(@"The following file has been dropped or selected: %@",file); // Process file here return YES; // Return YES when file processed succesfull, else return NO. } </code></pre>
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    1. COI added the proper extensions to CFBundleDocumentTypes (*.xml file) But i don't understand how to configure the delegates... At the time i got a "selectFile" and all of my code depend of the result of my selectFile... how can i work and configure with the selectFile AND the openFile (to allow drag&drop feature)... Thanks for your help!
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    2. COI added some additional info, this explains how to process both dropped and selected files with one piece of code.
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    3. COWorking great!!! Thanks a lot Anne!
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