function Split-File ([string]$inFile, [int]$bufSize = 500kb) {
    $stream = [System.IO.File]::OpenRead($inFile)
    $chunkNum = 1
    $barr = New-Object byte[] $bufSize

    $fileinfo = [System.IO.FileInfo]$inFile
    $name = $fileinfo.Name
    $dir = $fileinfo.Directory

    while ($bytesRead = $stream.Read($barr, 0, $bufsize)) {
        $outFile = Join-Path $dir "$name.part$chunkNum"
        $ostream = [System.IO.File]::OpenWrite($outFile)
        $ostream.Write($barr, 0, $bytesRead)
        $ostream.Close()
        Write-Host "Wrote $outFile"
        $chunkNum += 1
    }
}

Split-File("curl.exe")