复制两个VirtualBox虚拟机文件vdi，注册时出错的解决办法

Failed to open virtual machine [...]
Trying to open a VM config [...] which has the same UUID as an existing virtual machine.
解决方法：
1运行CMD命令（从VBox安装目录运行）VBoxManage internalcommands sethduuid <VDI/VMDK file>得到 UUID

2.vbox在文本编辑器中打开文件,用上面得到的UUID更改<Machine uuid="{...}"和<HardDisk uuid="{...}"中的UUID