WindowsRPC.ps1

$username = $args[0]
$hostname = $args[1]
$currentPassword = $args[2]
$newPassword = $args[3]
Add-Type -AssemblyName System.DirectoryServices.AccountManagement
$principalContext = New-Object System.DirectoryServices.AccountManagement.PrincipalContext("Machine", $hostName)
try
    {
       $User = [System.DirectoryServices.AccountManagement.UserPrincipal]::FindByIdentity($principalContext, "SamAccountName", $username)
       $User.ChangePassword($currentPassword, $newPassword)
    }
catch
    {
      throw $_.Excepion.InnerException
    }