What is .TCX file?
XML file used to transport fitness data between Garmin products; supported by various Garmin GPS devices; may include data such as type of sport, lap time, distance, calories, intensity, and other information.
TCX files can be opened with Garmin Training Center software. They are also supported by MotionBased.com and the Garmin Communicator Plugin.
The TCX format is available in both TCX v1 and TCX v2 schemas.
Recommended Software Programs to open .TCX file