Add Support for IE 10 and Edge

Newer Internet Explorer seem to have stopped the support for opening WebDAV documents via an ActiveX (or maybe I have a configuration issue on my side ...).

However they support navigator.msLaunchUri (see https://msdn.microsoft.com/en-us/library/jj154912(v=vs.85).aspx) ) and this allows to open at least office documents (see https://docs.microsoft.com/en-us/office/client-developer/office-uri-schemes )

I will at least give it a try if that is worth something.