How to remove Virtualbox extpack

The following commands show examples how to list extension packs and remove one:

$ VBoxManage list extpacks
Extension Packs: 1
Pack no. 0: Oracle Virtual Machine VirtualBox Extension Pack
Version: 4.1.12
Revision: 77218
Edition:
Description: USB 2.0 Host Controller, VirtualBox RDP, PXE ROM with E1000 support.
VRDE Module: VBoxVRDP
Usable: true
Why unusable:

Now Remove or Uninstall extpack as following:

$ VBoxManage extpack uninstall "Oracle Virtual Machine VirtualBox Extension Pack"
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%
Successfully uninstalled "Oracle Virtual Machine VirtualBox Extension Pack".