I installed Photoshop CS6 extended full version on Mac Os 10.7.4. When I try to save an image as a tiff I get a .raw, if I choose jpg I get .dcm, for pdf .jcm and so on. I already deleted CS6 prefs.psp, but it didn't help. How can I fix that?
Your problems lies with the probility that you transfered Adobe plugins from an older version to CS6. THis is a no no.
Delete all old plugins you transfered, and if you pointed CS6 to a plugin folder cancel that link.
If you have 3rd party plugins they should be put in plugin folder, but it is best to download latest version from the web site rather than just copy them over.