FYI - when students using Mudbox 2013 from a school try to open their file in an acadmic version, also 2013, they may receive this error.
File version is too new or is corrupt
File name... (It gives the path to their file)
File version 13, current version 12
This occurs when they are coming from a machine running service pack 2 and trying to open a file in their academic version that has not been updated. Updating the academic version to Service pack 2 seems to resolve the issue. Not sure if this is also a problem between pro versions.