unable to load wold - help desperately needed

Hey all,

I am unable to load a world that I have been working on for a long time. I would really, *really* appreciate being able to recover any or all of this file. Please let me know if you think you can help.

You can download my file here: http://dl.dropbox.com/u/9101279/experimental.a2w

I would greatly appreciate anyones help in getting this file to open!!


Full error message (saving as text in this post caused an error): http://dl.dropbox.com/u/9101279/error.png

Short error message:
Unable to load world
Alice 2.2

Throwable that caused the error:
java.io.FileNotFoundException: Not Found: NoCheck/__Unnamed3__/
elementData.xml

What I've tried:
I've read through the posts on here pretty extensively. I'm trying to unzip the file, make changes, and rezip it as a2w to see if it will load. The problem is, even if I go through these steps without changing anything, the error message changes, suggesting that I'm doing something wrong.