I hope one of the experts here will be able to save the files, which are very necessary for my work. My excel file became corrupt for very obvious reason..my little brother just deleted it it was no intentionally, but i`m still disappointed. I have tried to recover it with some program. The file appeared - everything is ok, at first sight. But it doesn`t want to open. I get an error message: Excel cannot open the file because the file format or file extension is not valid...File is corrupt.
So, maybe anyone know how to solve this problem. I will be very appreciate for any advice.

P.S. I use MS Office 2007 with Windows XP