Rename files in a directory based on their file extension. Can also rename files in all subdirectories recursively. Has an undo function to correct any mistakes. Can rename files using a unique number and character sequence, a numerical incremental list (0.txt, 1.txt), random numbers, the old file name (to add prefixes and suffixes to existing files), the current day, month and year.
Version 1.1 may include unspecified updates, enhancements, or bug fixes.