Hello mmerelles,
Thank you so so much for the help and really detailed information.
I have tried your suggestion today, and it works, I could export the simbrief´s flight plan and it was recognized, after I created the coroutes folder as you said.
Besides, yes, I use Navigraph, and the AIRACs in simbrief and the plane were was current one, 1907.
Thanks a lot again
Javier