To install the VirtualBox Guest Additions on Windows 10 build 9926 (January build) and use their most important features (Shared Folders and Auto-resize Guest Display), you have to make some adjustments.
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I blogged about the topic for a previous build of Windows 10. With the latest Windows 10 and VirtualBox versions, things are different. You no longer need to install Guest Additions in Windows 7 compatibility mode on Windows 10 build 9926 under VirtualBox 4.3.22. However, not all the important Guest Additions features will work, and you will need workarounds.

Copy and paste ^

If you enable Shared Clipboard on the VM’s Devices menu after you install Guest Additions, copy and paste between host and guest should work now.

Enabling the shared clipboard

Enabling the shared clipboard

Shared folders ^

If you add a shared folder from the Devices menu, you will notice that you won’t be able to access the folder using the VBOXSVR link in the Network folder. However, you can make shared folders work if you enable Auto-mount and Make Permanent when you add the share.

Setting up shared folders

Setting up shared folders

After you reboot Windows 10, a driver letter should be assigned to your shared folder. Even though Windows 10 shows the drive as disconnected, you should be able to copy files between host and guest.

Disconnected Network Drive

Disconnected Network Drive

Auto-resize Guest Display ^

Unfortunately, the Auto-resize Guest Display feature still does not work in Windows 10 Preview build 9926 and VirtualBox 4.3.22. However, if you want to change the display size of your virtual machine, you can do this in the Windows 10 Control Panel by right-clicking the desktop and clicking Screen Resolution. VirtualBox should automatically resize the guest display.

In my case, none of available resolutions fit my screen. However, thanks to Diego’s tip, I am aware of a workaround. It is possible to add a custom display resolution with VirtualBox’s VBoxManage tool. Make sure that your VM is powered down and that the VirtualBox Manager is not running. Now, open a command prompt and type (or copy and paste) the following command:

"%ProgramFiles%\Oracle\VirtualBox\VBoxManage" setextradata "VM name" CustomVideoMode1 1600x900x32

Adding a custom display resolution in VirtualBox

Adding a custom display resolution in VirtualBox

Replace “VM name” with the name of your VirtualBox virtual machine, and change the screen resolution to your liking. After you start the VM, you should see the new resolution on the Windows 10 Control Panel.

Custom display resolution added

Custom display resolution added

You can add a second resolution by replacing “CustomVideoMode1” with “CustomVideoMode2” in the command above.

3 Comments
  1. Josh 7 years ago

    Thanks, that was very helpful!

  2. Josh 7 years ago

    Auto-resize works in build 10074 when you enable 2D accelaration. Woo hoo!

  3. Josh, thanks! That's interesting info.

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