MY WORK IS LOST OR CORRUPTED, I NEED A HEROE FOR FIX THIS, PLEASE HELP ME :( :( :( :(
Can you explain it more? Have you already googled a solution?
What happens is that my computer freezes and I think I saved the project badly, so it happened that the program was also uninstalled in steam and I had to reinstall it. already installed I tried to reopen the project and I got that error and it doesn't let me in my progress :(
Again you're not giving me much to work off of. So I just googled "RPG Maker Unexpected file format" and looked at what people did. Like this one:
https://forums.rpgmakerweb.com/index.php?threads/unexpected-file-format-error-fix.64697/
If you can't recover anything, let this be a lesson to create backups and use something like Git(Hub).