This isn’t late breaking news, but worth posting imo.
Mac users can no longer simply run Cubase SX 3 in order to convert old VST files.
SX 3 was a PowerPC app, and Apple dropped PowerPC emulation from Mac OS 10.7
Short of purchasing a Windows license and running it in Virtual Box (or maintaining old machines) there’s no way to to access these old files on one’s own.
edit: It looks like you can install an older version of OS X inside Virtual Box (from Oracle) to achieve this. I haven’t had time to test it though. Is someone using this method?