TTCN file extension - TTCN-3 script file
What is ttcn file? How to open ttcn files?
File type specification:
The TTCN file extension is associated with the TTCN-3 (Testing and Test Control Notation) scripting language developed by ETSI and used to write detailed test specifications. The .ttcn file stores source code of script written in TTCN-3.