I am not that proficient when it comes to Macs, unfortunately. (I'm a linux/windows guy) I know that lax files are used by ZeroG to launch a Java app. The only other thing I could think of would be to look for an app called LimeWire in your install directory. It is probably made by ZeroG (which uses the lax file). But it sounds like things are working out over there for you.

I'm not sure what to think of Mac File extensions. Are they similar to Windows file extensions (eg .png files open with Quicktime)?
If you'd take the time to explain this to me, I'd be very thankful!

As for the Java location, I've been told that Java can only reside in one place on the Mac. You can't choose where to install it like you can on other platforms like Windows.

When you find out exactly which extension you restore causes the problem, be sure to post or PM and let me know. That way, other users will be able to solve the problem you're having.

:-)