powershell loop through files

foreach.ps1

$files = Get-ChildItem -Filter *.mkv
foreach ($file in $files) {
    #Write-Output "ffg $file.Name"
    $b2 = "b2-windows.exe"
    $args = "upload-file gyozobucket {0} movies/columbo-hu/{0}" -f $file.Name
    Write-Output "$b2 $args"
    Start-Process -FilePath $b2 -ArgumentList $args -Wait -NoNewWindow
}