PowerShell SharePoint to cancel workflows

$ver = $host | select version
if ($ver.Version.Major -gt 1) {$Host.Runspace.ThreadOptions = "ReuseThread"}
Add-PsSnapin Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue

$TargetWeb = "http://sharepoint/"
$TargetLibrary = "Library"
$Filename = 133 # the item ID
 
$MyWeb = Get-SPWeb $TargetWeb
$list = $MyWeb.Lists[$TargetLibrary]
$item = $list.GetItemById($Filename)

foreach ($wf in $item.Workflows) {
#Cancel Workflows      
[Microsoft.SharePoint.Workflow.SPWorkflowManager]::CancelWorkflow($wf);    
}

WRITE-HOST "Discarded workflows"