Mark the desired directory and open the Change file names and file entries to lower case dialog box. Should the Save opened projects before? (recommended) window pop up, confirm with OK.

Change the directory to be scanned if desired.

Change file names and file entries to lower case

Create backups from project files: If necessary, apply backups of respective project files.

Put original directory name in dir.def translation file: When activating the option, the entries written in upper case letters will be moved into the respective language file before they are adjusted to lower case letters.