Today, In Nokia Forum Discussion I found a developer ask this question, this is a frequently asked questions. So I write this TIP. I wish it can help more developers. (author website: http://www.symbianer.com)

Q: How to use extended filename launch an application? 

A: If your document is clicked on, a recognizer will run to launch your app and pass it the filename. OpenFileL() will be invoked on that file by default. About recognizer, you can reffer to the s60 sdk Document Handling

Document File Creation

To further reduce application startup time, Series 60 by default disables document file creation and opening. In other words, CAknDocument::OpenFileL() returns NULL. OpenFileL() is called by the framework during application initialization, and returns the file store containing the application’s document. Series 60 applications must override CAknDocument::OpenFileL() if they need to store and restore data.

When you clicked your document, the file path and file name will pass by "aFilename", so you can use "aFilename" to get the  informations of your clicked file.

you can visit my website get more tips.

website: http://www.symbianer.com