Sony Ericsson Xperia X8 :: Where Can Get Rid Of Tons Of Unuseful Preinstalled Apps?

I have bought a new Xperia X8 but when i tested it at the shop I couldn't find 2 features that should be bloody basic standard for nearly EVERY OS out there. These features are:

1. A standard File-Explorer (for fast cross access of Photos, Sound, Music etc.nearly every mobile phone since 2000 had this feature)

2. A App-Manager to uninstall these tons of preinstalled apps I personaly will never use (like Doodle-Jump, Crazy Penguins etc.)

I am a PC User for aprox. 20 Years now and these features are exteme important for me. However I never really was in a situation where an Operating System came without a file-explorer even Windows 3.11 in the good old days had this feature directly implemented.The Man who sold me the phone said, I should test it at home and when I'm not compfortable with it, I could bring it back but I hope someone here can show me these features.