How can I open a file from CS4 in CS6. Do I have to convert? export? or how do I save it in CS4 so I can open it in CS6?
Photoshop files are generally backward compatible. This backward compatibility is especially maintained if you check the
If there is a problem with one specific Photoshop file you have, we'd be happy to help you open and save that file if you edit your question to include the file and what you've already tried.
Welcome to SuperUser, by the way!