I used Programs and features in Control Panel, and clicked on Removing Features in Windows. I unclicked IE and it removed it from my computer, and then clicked it again so it got re-installed, voilà "Open With" Internet Explorer has returned.
Yes, there already is a sync feature. Its currently in the testing release and can be enabled in the stable release with a flag IIRC. It only syncs bookmarks at the moment though. In 29 it has some extra features that were just added. The ability to see open tabs on other synced devices for one.
I don't know if the previous two posts are directed to me or the OP. If to me, I understand that the QNAP cannot be accessed while in Turbo mode, just as I understand why Turbo allegedly exists (I have a metered connection). I made the suggestion in case the OP had Turbo enabled for perhaps the same reason as I.
Using Opera 27.0.1689.76 under Windows 8, I seem to be again suffering from an old problem: pages don't stop loading unless I tell them to stop. This can slow things down.