CAESAR II 5.30 and 5.20 build 100715 use Personal Isogen 6.3.0, the earlier build of 5.20 uses Personal Isogen 6.0.0. "idfgen.dll" version 7.3.0.13 is with Personal Isogen 6.3.0, and "idfgen.dll" version 7.0.0.16 is with Personal Isogen 6.0.0. Users are not supposed to change that file, because those isogen dll files work as a group, swap individual file may disable other functions.

Regards,