getting handler of OS

[sreekanth]

Hi all,
My question is as follows:

I have a applet in my webserver which loads with a page .What the
applet does is it downloads a file (may be of any type).For this i
wrote a signed applet.Now comes the exact problem.As soon as the file
is downloaded into clients system,I want the applet to launch the
default application for the MIME type or extension.

How could this be done?

Is there any possibilty to get the list of applications assosiated with
that extension or MIME.

Thank you for listening to my problem

Sreekanth