Campaign Creations

Hello,

Is it possible to edit original campaign missions? Like change hero abilities, or sound files. In my case i would like to change heroes in the bonus campaign Founding of Durotar, or just change Rexxar's or Rokhan's abilities...
Is it possible?

Thanks in advance

PS: excuse my bad english

Yes you can, you'd have to find the maps in the wc3 mpq files though.