window.open() is not working for file system files

One of the screen in my application has a browse button and a preview button.

browse button is normal html browse button and preview button is to open a new window with the file selected by browse button.

my script could not open the file in the new window however if the file is a downloaded one it is opening in the new window.

What could be the reason behind this behavior.

Please suggest some workaround for the same.

Thanks

Prabhakar

I am attaching the code that I was trying to run.

This is fundamentally impossible, because JavaScript has no access to the client file system. Imagine the security implications of a web page that contains a script opening just any client file.
[ December 05, 2007: Message edited by: Ulf Dittmer ]