The structural input file has an extension of ".STR". When you switch jobs, or close CAESAR II completely, all files associated with the job a zipped up into an archive (.c 2 s in the case of structural jobs, .c 2 in the case of piping jobs). The archive is expanded the next time CAESAR II is started and any of the modules are activated.

The last AISC structural data base that we added to the software is indeed the 1989 edition. That is the latest we have at this time.