For Windows 8 and higher only the WDDM Direct3D video driver is available.
For basic Direct3D acceleration to work in Windows XP guests, you have to install the Guest Additions in "Safe Mode", see Chapter14, Known limitations for details.
If the host is running a newer Virtual Box version than the Guest Additions, a notification with further instructions is displayed in the guest.
When the difference is too great (e.g., a VM paused for hours or restored from saved state), the guest time is changed immediately, without a gradual adjustment.
The Guest Additions will re-synchronize the time regularly.
These provide an easy way to exchange files between the host and the guest.
Much like ordinary Windows network shares, you can tell Virtual Box to treat a certain host directory as a shared folder, and Virtual Box will make it available to the guest operating system as a network share, irrespective of whether guest actually has a network.
A Windows guest should then automatically start the Guest Additions installer, which installs the Guest Additions into your Windows guest.