obviously not at many cases, and some replies never state why it is like that. It's better to understand why and not just get the solution. Besides if a question is answered, the person who created the thread should state that in a way. Either by asking someone to close the thread, or by marking...
You will need to move rooms, items in rooms and users if you want it to stay the same. Takes time and patience but it's possible. And for your users passwords you would have to use precisely the same hashing method used in ur old cms
When decompiling swf files you will notice they contain code, readable code that actually means something, well Habbo.swf has most of the data or settings to get data from some other file.