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In Dolphin we use this thing:
http://www.google.com/search?hl=ru&sa=X&oi=spell&resnum=0&ct=result&cd=1&q=%22Mod+Rewrite+module%22&spell=1
Also you can see how you can resolve your situation here:
http://www.boonex.net/dolphin/wiki/GenDolTShooter#Q:WhenItrytoopensomebodysprofileIgetthispage:NotFound
Regards