No! BoxedApp SDK doesn't create any temporary files, all virtual files are really virtual. They are totally in memory.
No! BoxedApp SDK doesn't use drivers or another low level methods. BoxedApp SDK works in user-mode.
Yes! BoxedApp SDK is fully compatible with x64 environment. There is a x64 build of the DLL.
BoxedApp SDK is fully compatible with all Windows versions beginning with Windows 2000.