From Lazarus-ccr

LineEnding is end of line marker. This constant (system unit) is used when writing end of lines to text files.

[edit] End of line markers

• Line feed (LF, #10 ) Linux, BSDs, Unix, ...
• Carriage return + Line feed (CRLF #13#10) MS Windows
• Carriage return (CR #13) Mac OS Classic

Mac OS X often accepts Line feed and Carriage return.

[edit] See also

• LineEnding Constant describing the current line ending character.
• SetTextLineEnding Set the end-of-line character for the given text file.