Lets say you want to open an MS Word file from your web page. You can just link to it using a normal HREF. Browser settings and the operating system will take care of the rest. If it's a PDF, Reader will open. Word will launch for a .doc file. Excel for an excel sheet. ( Or perhaps your browser independent equivalents ).

How do you give the same functionality to an AIR Application? This exact question came up on the Flex Coders list recently and the general concensus was that it could not be done. That surprised me, because I figured you could do something very similiar to what you would do in a web page and let the operating system handle it. This would (I assume) not violate ay security protocols inside AIR. Am I right?

I played around with it and found one solution to the problem. It's far from perfect, though. I accomplished this using the NavigateToURL functionality. The code is really simple, just a button to open the file:

view plain print about
1<?xml version="1.0" encoding="utf-8"?>
2<mx:WindowedApplication xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
4 import flash.net.URLRequest;
6 public function clickButton():void{
7 var request : URLRequest = new URLRequest('C:\\projects\\test.doc');
8 navigateToURL(request )    
9 }
12 <mx:Button click="clickButton()" />

Click the button, it creates a URL Request and then uses navigateToURL to launch it. In my tests, this will launch a browser instance outside of AIR; and that browser instance will deal with the file, launching word, or a text editor, or whatever depending upon the file.

I can understand how, in some situations this would not be ideal. Perhaps in AIR next we need a navigateToApplication?