Run the replace now with button Replace all.For all other encodings like UTF-8 or ANSI the encoding option does not need to be used for this replace in files. If the text files are encoded in UTF-16 little endian or UTF-16 big endian, check also option Use encoding and select encoding 1200 (UTF-16 LE) or 1201 (UTF-16 BE).Check the option Regular expressions and select the regular expression engine Perl.Check the option Search subdirectories.Click on button Advanced or the button with the gearwheel icon to open the advanced options.the parent directory containing the subdirectories and files to change. Multiple file extensions can be also specified by separating them with a semicolon like *.txt *.htm? *.php Enter for In files/types the string *.* or just * or whatever is suitable to match only text files and exclude binary files.Select Files Listed option if not already selected.Enter as replace string either rn to convert in all files all line endings to DOS/Windows or just n for Unix line endings.Click in menu Search on Replace in Files.This can be done for example with text editor UltraEdit.