Originally posted by Guy Allard:
Linux (and any Unix) does not have the concept of "file extension associations" in the way Windows does.
Ummmmm... Guy, wake up -- it's 2007!
All the popular Linux desktops (KDE, Gnome, etc) offer this feature, and have for some years now. Most distros include a large number of such associations out of the box, including clickable jar files.