Okay.. Ive been working on integrating an ArcIMS session which is overlayed on top of an ecw image that is being served out using the IWS1.6
When connecting through the network (not going through the internet) the ecw images are being displayed however at work - through the internet - they do not seem to work "can not open ewcp://blah blah" even though its pointing to the right place. It seems to work in netscape file.. Outside of the work network it seems to work on some machines but not others.
Sounds like classic MS IE vs Netscape URL handling differences. I've seen it all my life, but not sure of the exact cause. Perhaps you could tweak the browser settings within IE to get it to work? Or be sure that your webserver is pumping out standard (i.e., MS compatible) URLs?