dear azslow3,
Many thanks for your implication in helping me.
Unfortunately, as i said above, Sonar 8 is no more installed on my pc and i really can't reinstall it.
But your first solution would probably suit all my desires, that is to say mainly tracks (audio and midi), even tempo maps and markers.
It doesn't matter if i don't find the original FXs or Synths, because the ones i use today are no longer the same as those i used 15 or 20 years ago.
And it doesn't really impact the composition itself.
So thanks for this unexpected support of yours.
I suppose it will do for all my old projects.
I am looking forward to hearing from you soon
Regards