I haven't tried this with WinCE 6 but it might work.
1. Download my program from http://www.navitotal.com/showthread.php?1274-Garmin-Mobile-XT-for-WinCE5.0-program
2. Using Winrar, extract the folder to your SD card.
2a. Start the program.
3. Choose "connect to a Garmin device."
4. "Skip" scanning attached.
5. Choose yes to skip.
6. Choose I agree.
7. Choose no to connect to other Garmin devices.
8. Click arrow on lower left.
9. Click "wrench icon" - tools.
10. Click settings. ...