I have just formatted my HD and reinstalled CS6. I tried to keep on working on an old project and got an error message:
"This project contained a sequence that could not be opened. No sequence preview preset file or codec could be associated with this sequence type."
How can it be solved?
Try to create a new project - what do you see for available sequence presets? If there are only a few options, then it's likely that the install did not go properly, and you don't have an XDCAM preset available, thus the error. Always a good idea to run the "Adobe Cleaner" when reinstalling to avoid these problems - http://www.adobe.com/support/contact/cscleanertool.html
Safe Harbor Computers
unfortunately it is impossible to import XDCAM-EX files.