Yate does its best to keep track of files that are loaded. Whenever you attempt to Save files, the file location is validated and updated if necessary. When files have been externally moved or deleted and Yate cannot locate them, the File Name and Path columns display their content preceded by a ! character.
If you have externally moved or deleted files and have then restored them, you can have Yate validate that the locations have been restored with this function. If a location has been restored, the identifying ! characters will be removed.