A ttcn file extension is related to the TTCN-3 scripting language and used for its script files.
TTCN file extension - TTCN-3 script
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), a scripting language developed by ETSI and used to write detailed test specifications.
The ttcn file stores source code of script written in TTCN-3.
This ttcn file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.