There is only one file type that uses the .TREC extension:
TechSmith Recording File
A TREC file contains a screen recording captured by TechSmith Camtasia, a screen recording and video editing program. It stores audio and video from a user's screen recording session and includes metadata, such as cursor effects and transitions. TREC files are typically used for storing content for tutorials and demonstrations.
The TREC format is compatible with both Windows and Mac versions of Camtasia, which makes it more convenient for sharing recordings across platforms. TREC files are saved as part of .CAMPROJ (Windows version) and .CMPROJ (Mac version) screen recording projects.
NOTE: The TREC extension was released with version 8.4.0 of Camtasia Studio (Windows version) and version 2.8.0 of Camtasia for Mac. It replaced the .CAMREC and .CMREC extensions for camera recordings.
Updated: July 17, 2019