you see me quite perplexed, 'cause as a DW-dinosaur you will find on my harddisk files made with an ancient Dreamweaver 4. No problem to open them with CS6.
I'm sure you use the open button like this (see below), or "CTRL + O" or "File > Open" BUT we never know
Also Thank you Hans-Günter - ja, ich habe es mit Offnen probiert - aber dann hatte ich im Dateiordner alle WebSiteprojekte aber eben nicht die konkrete Site ....
I am not a dino ..... but thanks to Nancy I found the solution