This will only work on the files that are protected with the simplest passwords like "abc"; otherwise, the password recovery process may take years. A while back, I tested a few password recovery products, and eventually decided that online services were the best. They simply remove the password-- you won't learn was the password was, however the removal is almost instant. If you need a certain name, I used one named Password-find which seemed pretty nice. Use it or try googling something like "online excel password recovery".