Resolved Minecraft Modding Unhadled Exception Error Please Help

whenever i try to open my gamesave file into the modding tool it pops up with unhandled exception file not found and i have no idea on how to fix it can someone please help me out

heres my game save http://www.2shared.com/file/kbpslCLc/Save20120617061850.html

 

I'm trying to find a solution to this too, I get the error message no matter what save I use.
If you manage to fix it or whatever please let me know.

 

I am sure this problem has been fixed.. Refer to the minecraft problems and solutions thread.

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i did look at it and did what it said and it still doesn't work, does it have anything to do with the fact that my computer is 64-bit

 

Mine is 64-bit and works fine.

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what exactly is an unhandled exception?