You plug the drive into a computer (not yours)
Windoze will then write a little record in its USB device database of the serial number of your device. Should you visit the same computer next year with the same device then it will remember you.
You view / change on of the files on the flash drive
The viewing program has no idea how to unencrypt the files on your device, you already did that in your previous step, now your files are open slather to anyone who has access to the computer your device is plugged into.
USB stick encryption is only good for physical loss of the USB stick and not much else. Accessing sensitive data via a public computer is simply insecure regardless of the measures taken (except the one were special polarised glasses are needed to be able to read the screen).