There is only one file type that uses the .TCLOGS extension:
TestComplete Log Configuration File
Log configuration file created by TestComplete, an application that enables users to test applications; contains the paths and names of log files that hold testing results for projects or project suites; includes information that describes the duration of the script and who (username) ran it.
When a TCLOGS file is created, it is placed in the "Log" folder with the corresponding .MDS and .TCLS file.
NOTE: TestComplete projects and project suites allow you to test different applications using the same settings. A TCLOGS file is created when testing a project.
Updated: March 14, 2014