Thanks Steve. Yes, we are in maintenance with Equisys so I raised it with them and they were only able to provide the FAQ above, basically saying there is no choice but to use IE. I raised it through our NAV partner to MS and they confirmed that the call to use IE is coded deep inside the .NET wrapper that the addin uses and it can't be changed. I think MS will have to make a change to either use Edge, or allow specification of browser to use as they are the ones discontinuing IE. It affects not just Zetadocs but any other addin using that .NET warapper.
So in the meantime I posted here in the hope someone had a workaround, even a hack I would take at this point.
