Sometimes you can find which way the seam opens by pressing firmly
along the seam line. The half that presses in will usually allow you to
get a shim or blunt blade in under the opposite half. I use plastic or
wooden shims tomaintain the seperation. Often I have 4 - 5 shims in the
thing before it pops. Sony remotes sometimes unsnap one way in the
battery compartment and the opposite way around the main body.

Richard