Ok I am new to the pocket pc so it might be me, but here goes:

According to File Explorer starting at My Device
Storage Card\MAMEBoy\ROMs\pacman


When I run MAMEBoy it lists Pac-Man, but when I select it and tap Play! nothing happens (the play icon is the same color as the screen background but I believe it is "active")

If I copy and paste the MAMEBoy directory to reflect:
Program Files\MAMEBoy\ROMs\pacman

I get the same results, nothing...