Files with the .TEC extension contain a compiled version of mapped text. Before the text is compiled, the mapping is stored in a MAP-type file in the form of pure text. The files are generated by TECkit software, which stands for Text Encoding Conversion toolkit. The software sometimes cooperates with LaTeX tools, converting the characters during the generating of LaTeX documents in multiple languages.

TECkit was created for converting the coding type of a text from 8-bit to Unicode.