tinylama

$outfile = "tinyllama.zip"
$parts = Get-ChildItem "tinyllama.part*" | Sort-Object Name
$buffer = New-Object byte[] (4MB)

$out = [IO.File]::OpenWrite($outfile)
foreach ($file in $parts) {
$in = [IO.File]::OpenRead($file.FullName)
while (($read = $in.Read($buffer, 0, $buffer.Length)) -gt 0) {
$out.Write($buffer, 0, $read)
}
$in.Close()
}
$out.Close()
Write-Host "Reassembly complete: $outfile"

copy /b tinyllama.part001 + tinyllama.part002 + tinyllama.part003 tinyllama.zip