Alain,
A subsidary question is what a gramps version is able to import (LF, CR-LF, CR) under Windows and Linux.
I haven't tested all combinations, but I can import files generated by Windows programs like AQ, PAF and RM in Linux Gramps. There is a problem with FamilyTreeMaker though

https://gramps-project.org/bugs/view.php?id=7398

which I can reproduce here with Linux Gramps. And I think that this may be related to CR-LF, because there is code to handle this case, which may not work if an extra CR is found. That's just a guess, though, and I haven't tested that guess yet.

regards,

Enno