Hi Charles,
Sorry for the late response. I was hoping another IAS user would chime in with their experience. Does the IAS software have a user manual or anything else that would describe the file format it expects? If you can find this, I could probably help determine what would need to be done to make it work.
The file that you said works has several configuration settings included, is it possible the IAS software expects one/some of these?
Regards,
Andrew