all I use dreamweaver for is for a ftp and to occasionally search my site for confusing CSS thats in the phpbb folder
Just to add another voice to the advice:
Don't use Dreamweaver for phpBB at all, as stevemaury and Brf say - they speak from experience - having seen many problems caused this way.
Get a good, plain text editor like Notepad++ (NOT Windows Notepad) for editing -
and a proper FTP client like Filezilla for transfers.
they are both free to download and use