In windows and linux the WebBrowserEvent.WEBBROWSER_DOWNLOAD_ERROR is never
sent for either Internet Explorer or Mozilla.
I never got it even when errors where happening so I looked into jdic source
code. This event corresponds to native CEVENT_DOWNLOAD_ERROR in
This constant is never used in the Mozilla code either for unix or windows.
For Internet Explorer it is used in BrowserWindow::OnNavigateError, but this
method is not being mapped, in BrowserWindow.h. I guess
SINK_ENTRY_EX(1, DIID_DWebBrowserEvents2, DISPID_NAVIGATEERROR ,
OnNavigateError) needs to be added but didn't test it