neicul,
You can download a free player called "Flash Assist" by "Ant Mobile Software". Well, it's technically not a free program as it will expire after 21 uses but will still remain a fully functioning version after that period. I haven't tried it on my new x50v yet but used it a lot on my iPaq 4155. Even played JibJab movies on it.
You can download it here:
http://www.antmobile.com
-tom