Philipp Stephani writes:
> - \c_job_name_tl contains the token \tex_jobname:D, not the job name
??? you are sure?
it is defined as
\tl_set:Nx \c_job_name_tl { \tex_jobname:D }
which gives you the jobname in \c_job_name_tl and not \tex_jobname:D
at least if you load expl3.sty. Not sure what happens if you attempt to
generate a format including expl3, for that situation we may have to set the
constant later.
frank