vdi to vhd conversion represents an export of data from VirtualBox disk format (.vdi) to Virtual Disk format (.vhd), which should be possible in several virtualization programs like VirtualBox or Parallels desktop. Generally speaking, typically only whole virtual machines are converted, not just their parts so make sure you have all the files needed to convert vdi to vhd.
Open VDI file Open VHD fileFree system virtualization platform for Linux operating system developed by Oracle