How you set up your device effects how your data is collected, and often how it is reported. For more information on this device's set up, see the online owner's manual here.
If your Garmin isn't already paired to Ant Agent, or your workouts are not being transferred via Ant Agent, you can view how to re-pair your Ant Agent here. It will take a while for the Ant Agent to recognize your device and then it will transfer everything on your device to your computer. Once it has done that you should be able to find the new files.