The original posting had an issue and we have reposted the service pack. Please, if you have installed the service pack please uninstall it and install the newly posted version. You can ensure you have the right service pack by checking the "About Inventor Fusion" box from the help menu. It should read version "126.96.36.199."
To remove a service pack go to add/remove programs and choose the updates view. The service pack should be listed there.
15" Macbook Pro Retina - OSX 10.9 in Portland, Oregon
Just installed service packs 1, 2 and 3. Rebooted. Opened 2 Solidworks files. Inventor 2012 SP1 failed to translate them by said they were 2011 files. Fusion, when trying to open the files, opens a new document but it's empty. So basically, nothing from Autodesk (AutoCAD, Inventor or Fusion) will open a SW 2011 file.
And no, I am not at liberty to post the files here.