I can duplicate this fairly consistently, although I'm not sure what the cause is.

GW 8.0.2 on Windows XP SP3 Pro.

Sometimes, "html" email comes with a .HTM or .HTML attachment.

In Gwise 7.x we could always double-click on it and it would open in IE.

However, now when we double-click on it, it will state that this isn't a registered file, yet if you SAVE the file to the local hard drive and double-click, THEN it opens with IE.

I would imagine that as long as .HTM and .HTML are associated file types in Explorer (they are), then GW should pass that along to the OS, but it seems that something's getting mucked up?