If you have .VHD BitLocker encrypted files and would like to mount it using PowerShell:
$ss = Read-Host "Enter BitLocker Password:" -AsSecureString
Mount-VHD <path-to-VHD>\Example.VHD
#Check your disk manager which drive letter the volume is assigned to the VHD
Unlock-BitLocker -MountPoint <drive letter> -Password $ss