Special Mod Not Working Anymore

[Arrogant-One]

For the most part our upgrade from 3.6.7 to 4.1.12 went off without a hitch, but there was one casuality in particular. Our chess viewer.

It worked previously by someone attaching a pgn file to their post and it would automatically appear when the person pressed the post button and it would display in their post. But no longer.

Here is a picture of the chess board applet that would appear in a person's post:

http://chess.geniusprophecy.com/chess-viewer.html

Okay, so the instructions for installing this are here, close to the bottom of the page.

http://chesstuff.blogspot.ca/2008/11...er-deluxe.html

Now Viewer-Deluxe.jar is installed in my forum's root directory so I think the problem here is simply telling vBulletin that when someone attaches a pgn to their post, open it with Viewer-Deluxe.jar.

The million dollar question is how?