I cannot even find any reference about INRAC on the net. All I find is the acronym and brand in France of the "Institut National pour la Retraite ACtive", a training institute for senior people.
I find a reference in GitHub for the name of a module written in Perl for reverse engineering of RAC files used in the early 1980s by the RACTER program, used for chatting, an ancestor of IRC... But I don't know if you refer to this Perl module and its related language. This is an alpha module, not tested, not even documented.