A THREAD FOR NEWCOMERS!

I was working on a map and suddenly everything crashed. The map is no longer visible in the folder, but when I try to open it through the editor, the editor doesn't open the map and displays "Invalid or corrupted map file." I'm playing on WOG 3.58f. Is it possible to restore the map somehow? I have the "create backup before saving" option enabled, but I can't find the backup file anywhere. >I managed to restore the map to the folder with some tricks, but I still can't open it in the editor or in the game.