Hi,
Thank you for your answer.I have contacted french support in parallel of the forum and this is our first conclusion, maybe it will be useful for someone with the same problem.
The problem comes from SQL version of my collegue's computer : he can open his own projects but I can't on mine.
I have sent the project to unitronics support, they re-sent me a modified version which I can open with my PC. My collegue had also opened it, save it and after that I was unable to open it again.
We have concluded that the problem came from SQL, on his computer he has 2004,2005,2012,2014 and "compact" versions whereas I've got only 2012 version.
I don't know the difficulty/possibility for make compatible all SQL versions but it could be a improvement for Unilogic.
Finally, I apologize for my english grammar.
Thank you again,
Best Regards,
Jérémy