A tch file extension is related to the Complete Works and used for its graph or chart files.
There is one other file type using
the TCH file extension!
.tch - Borland C++ help document
TCH file extension - Complete Works graph or chart
What is tch file? How to open tch files?
File type specification:
The tch file extension is associated with the Complete Works. The tch file contains graph or chart. The Complete Works is discontinued product
Most likely some old format without support. No further information could be found.
This tch 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.