Using MacBook Pro, MacOS 10.14.4 (Mojave) and Windows 10 via Parallels 14.1.3. In Safari on the Mac, I have two extensions, both of which seem to be intended to open a current Safari page in Windows Internet Explorer (launching Parallels if it isn't already open). The extensions show in Safari Preferences/Extensions as ""Open In" button for Internet Explorer 1 by Parallels", and "Open in Internet Explorer 14.1.3 from Parallels Desktop". The corresponding extension files, in ~/Library/Safari/Extensions are ""Open In" button for Internet Explorer.safariextz" and "OpenIE.safariextz". I would suppose only one is currently valid, but which one?
