Files with pts file extension can very rarely be encountered as debug files from Half-Life game engine.
PTS file extension - Half-Life map creation debug data
What is pts file? How to open pts files?
File type specification:
The pts file extension has also been reported to be used for debugging purposes in Valve's Half-Life game engine (GoldSrc Engine, customized id Tech 2 engine). Related to map creation debugging purposes. Most likely very rare.
The default software associated to open pts file:
Company or developer:
Valve Corporation
Half-Life is legendary first person shooter video game released in 1998 for Microsoft Windows and later for Sony Playstation 2. Player is assumed the role of Gordon Freeman, a theoretical physicist who must fight his way out of a secret underground research facility whose research and experiments into teleportation technology have gone disastrously wrong. Half-Life uses modified popular Quake 3D game engine
List of recommended software applications associated to the .pts file extension
Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open pts file, edit pts file, convert pts file, view pts file, play pts file etc. (if exist software for corresponding action in File-Extensions.org's database).
Unspecified and all other actions for computer programs working with pts file - Half-Life map creation debug data
Click on the software link for more information about Half-Life. Half-Life uses pts file type for its internal purposes and/or also by different way than common edit or open file actions (eg. to install/execute/support an application itself, to store application or user data, configure program etc.).
Microsoft Windows:
Main software associated with pts file by default:
Half-Life
Other suggested software:
WorldCraft
Valve Hammer Editor