I have this file i open yesterday with out a problem. now i can not open it. please help say's i can't, please help
I think you need to contact your VAR or GTAC. Not sure anyone here can help as it sounds like a corrupt file or a bug.
Normally you would see this message when you are trying to open files that were created with a newer version of Solid Edge.. Since you are using ST6 could it be that you have received files from someone thats using ST7 (beta) ?
Any chance that anyone has accessed the affected files with Solid Edge Student Edition?....as this would kill the files off from being used by any commecial version, and give that very message.
Design Manager Streetscape Limited
Solid Edge ST9 [MP7] Classic [x2 seats]