welcome to the os9 user group. OS9 files are mainly used by legacy EVG
industrial tools for wafer processing. These files contain several
compiled software modules which are responsible for controlling
various machine components.
Since you don't have the source code it will be rather hard to modify
any of these modules. But I think EVG is still in business and will
probably help you for a nominal fee.
Stefan from Austria
PS: Why do I have this certain notion that we know each other?