It is a type of text file. TLF means Timing Library Format & also known as Text Layout Format. TLF text provides the following enhancements over Classic text:
* Print-quality typography.
* Additional character styles, including leading, ligatures, highlight color, underline, strikethrough, case, digit case, and more.
* Additional paragraph styles, including multi-column support with gutter width, last line justification options, margins, indents, paragraph spacing, and container padding values.
* Control of additional Asian text attributes, including Tate Chu Yoko, Mojikumi, Kinsoku Shori Type, and Leading model.
* You can apply attributes such as 3D Rotation, Color Effects, and Blend Modes to TLF text without placing it in a movie clip symbol.
* Text can flow across multiple text containers. These containers are called threaded or linked text containers.
* The ability to create right-to-left text for Arabic and Hebrew scripts.