Since this is for a single site I don't think there's much value to Alwil in me becoming an OEM partner. (It sounds expensive too.
We won't be reselling anything. This is purely for use within a few websites that handle user submitted files. I have a working proof of concept at the moment using the command line scanner as a wsh.exec process. It works but I'll need to stress test it to see how many files it can handle per minute under load. Launching an out-of-process task is quite expensive in terms of processor cycles.
Just out of curiosity, what's involved in becomming an OEM partner.
BTW, I decided to use Avast in my application because I am a SurgeMail customer and I am very happy with the OEM implementation of Avast in SurgeMail.