I use a Java-based program called Maptool to play tabletop RPG's with friends over the internet. I have used this program for years without problems, taking all of my data and putting it into a file to run the game. Each file contains images and text data. I recently tried to open a file yesterday and received the following error.
Could not load campaign.
java.util.zip.ZipException: error in opening zip file
I am not sure how to proceed. I have heard rumors of others recovering a large amount of their files, but I don't know where to begin.