At the moment there will not be a command line to run explorer.exe - the idea is to put a line in the .txt file that would place an icon on the screen - clicking this icon will get one into explorer.By the same method another line will put an icon on the screen for SkyDemon to run from the SD card.
The SD card supplied with my unit had a .txt file called "addons" - opening this showed "modules" then a line starting with "NAVIGATE" then a command line. Putting the SD card in put a "NAVIGATE" icon on the screen.
I changed it to two lines - one called "SKYDEMON" and the other "WINCE-EXP"- both work fine.
You could just make a .txt file in notepad - but we need to know how your unit puts it's "navigate" or such like icon on it's screen. Copy and paste the .txt file/files on your next post and we will see. Have a look at the roadmap SD card and the FMS SD card - post both.
Regards
Alexander