I would like to cintribute my humble openion to the debate: You can rewrite the open command such as: open(File_name,parm,parm,parm...) { toupper(file)name); _open(File_name,parm,parm,parm...); } ( In Fortran jargon of corse). Hope ip helped. Michael ____________________________________________ ... YEH YEH ... RTFM yoursef!