thank's rickie
i tested by changing R00072.dat with aaaaa.dat it works
in the .dat there is "Á y ˜ ` f®"™ µQ ]ßÔR00072.SON ‡¬ ¬ V \ "
where R00072.SON is the link to the directory named R00072 including the B001, 2,3,4 .SON
i tested by replacing R00072 by bbbbbb and it works also
then it is possible to rename a posteriori
but in fact i wish that the reinit and the customizing of the name takes place directly in the helix