It would be great to be able to open a showfile that was created in a new version of Titan in an older software version. I realise that should this feature be implemented, it would only allow you to open files created from 10.X onward, however I think that this would be a very advantageous addition to Titan going forwards.
On a tour earlier this year, a console running v10.1 was damaged in transit and would not boot. I could only get an immediate replacement running v9.1 and could not use my touring showfile - instead I had to throw a quick busk show together and go with that until I could get my hands on a proper replacement.
Chamsys has absolute compatibility across it's entire MagicQ software history - older software simply disregards new features that it doesn't recognise in the showfile. In a touring showfile, such absent features can be easily worked around by replacing them with something different - a much better alternative to busking a potentially very complex show.