I need help with my map

well...looks like I screwed something up I have been working on my rpg for a year now and got all the triggers etc. done just to make it work now what happened was. I did something and now my map won't open because the shadow file has somehow been protected any one know how to reverse this?

First off, make a backup of your map.

Then open it with WinMPQ and delete war3map.shd from your map.
Then open your map in the WorldEditor and save it there.
The WE should have generated a new shadow map file when saving...

will try that when I get home