SW2012 SP5.0 doesn't open 2013 files

I've just installed SW2012 SP5.0, and I thought SP5.0 could open 2013 files. I've tried several files and every time I got this error message:

"An error was encountered while trying to open your file. Contact Technical support for a possible solution."

(Windows 7 X64 system) Is my SP5.0 installation corrupt or is this functionality not so functional yet?

SolidworksAdministration