I've finally found a way to resrore your lost maps!
1. To get started go to the folder User Data => Backups. There will be a back up, sorted by dates. Look for the time the files supposedly changed. 2. Copy these files somewhere safe. 3. Create in the game a new map. Add a pair of objects to map was not empty. Save, for example, under the name of "new" 4. Then go to the User Data folder and iterate through all the files and folders and look for the one