PowerShell + FTP in EXE

function Upload-File([string]$path,[string]$url,$username,$password){
    try{
        $request = [System.Net.FtpWebRequest]::Create($url)
        $request.Method = [System.Net.WebRequestMethods+FTP]::UploadFile
        $request.Credentials = New-Object System.Net.NetworkCredential($username,$password)
        [byte[]] $bytes = [System.IO.File]::ReadAllBytes($path)
        [System.IO.Stream]$stream = $request.GetRequestStream();
        $stream.Write($bytes,0,$bytes.Length)
        $stream.Close(); $stream.Dispose()
        $response = [System.Net.FtpWebResponse]$request.GetResponse()
        $result = $response.StatusDescription
        $response.Close()
        return $result
    }catch{
        throw $_.Exception.Message
        return $false
    }
}
function Download-File([string]$url,[string]$path,$username,$password){
    try{
        $request = [System.Net.FtpWebRequest]::Create($url)
        $request.Method = [System.Net.WebRequestMethods+FTP]::DownloadFile
        $request.Credentials = New-Object System.Net.NetworkCredential($username,$password)
        $response = [System.Net.FtpWebResponse]$request.GetResponse()
        [System.IO.Stream]$stream = $response.GetResponseStream()
        [System.IO.FileStream]$outstream = New-Object System.IO.FileStream ($path,[System.IO.FileMode]::Create)
        $stream.CopyTo($outstream)
        $outstream.Close();$stream.Close();$response.Close()
        $stream.Dispose();$outstream.Dispose();$response.Dispose()
        return $true
    }catch{
        throw $_.Exception.Message
    }
}

# Variablen ------------------------
$username = 'FTPUSER'  
$password =  'PASSWORD'  
$remotefile = 'ftp://ftp.beispiel.de/data.csv'  
$localfile = "$env:TEMP\data.csv"  
# ----------------------------------------

# Download file from FTP
Download-File -url $remotefile -path $localfile -username $username -password $password
# Start Editing file
Start-Process $localfile -Wait
# Upload file to FTP
Upload-File -path $localfile -url $remotefile -username $username -password $password
# remove local downloaded file
remove-item $localfile -Force

function Encrypt-String($plaintext,$password,$salt='jj3h4h5+tbbj2j281273#+', $init='j3j35&#*23kkk35!'){  
    $p = new-Object System.Security.Cryptography.AesManaged
	$p.Key = (new-Object Security.Cryptography.PasswordDeriveBytes ([Text.Encoding]::UTF8.GetBytes($password)), ([Text.Encoding]::UTF8.GetBytes($salt)), "SHA1", 5).GetBytes(32) #256/8  
	$p.IV = (new-Object Security.Cryptography.SHA1Managed).ComputeHash( [Text.Encoding]::UTF8.GetBytes($init) )[0..15]
    $encryptor = $p.CreateEncryptor()
    $msEncrypt = New-Object IO.MemoryStream
    $csEncrypt = New-Object Security.Cryptography.CryptoStream $msEncrypt,$encryptor,"Write"  
    $swEncrypt = New-Object IO.StreamWriter $csEncrypt
    $swEncrypt.Write($plaintext)
    $swEncrypt.Close();$csEncrypt.Close();$msEncrypt.Close()
    $p.Clear()
    [byte[]]$result = $msEncrypt.toArray()
    return [Convert]::ToBase64String($result)
}

function Decrypt-String($string,$password,$salt='jj3h4h5+tbbj2j281273#+', $init='j3j35&#*23kkk35!'){  
    $p = new-Object System.Security.Cryptography.AesManaged
    $p.Key = (new-Object Security.Cryptography.PasswordDeriveBytes ([Text.Encoding]::UTF8.GetBytes($password)), ([Text.Encoding]::UTF8.GetBytes($salt)), "SHA1", 5).GetBytes(32) #256/8  
	$p.IV = (new-Object Security.Cryptography.SHA1Managed).ComputeHash( [Text.Encoding]::UTF8.GetBytes($init) )[0..15]
    $decryptor = $p.CreateDecryptor()
    $msDecrypt = New-Object IO.MemoryStream @(,([Convert]::FromBase64String($string)))
    $csDecrypt = New-Object Security.Cryptography.CryptoStream $msDecrypt,$decryptor,"Read"  
    $srDecrypt = New-Object IO.StreamReader $csDecrypt
    [string]$result = $srDecrypt.ReadtoEnd()
    $srDecrypt.Close();$csDecrypt.Close();$msDecrypt.Close()
    $p.Clear()
    return $result
}

function List-FTPFiles([string]$url,$username,$password){
    try{
        $request = [System.Net.FtpWebRequest]::Create($url)
        $request.Method = [System.Net.WebRequestMethods+FTP]::ListDirectory
        $request.Credentials = New-Object System.Net.NetworkCredential($username,$password)
        $response = [System.Net.FtpWebResponse]$request.GetResponse()
        [System.IO.Stream]$stream = $response.GetResponseStream()
        $reader = new-object System.IO.StreamReader($stream)
        $list = $reader.ReadToEnd() -split "[\r\n]+" | ?{$_ -ne ''}  
        $stream.Close();$response.Close();$reader.Close()
        $stream.Dispose();$response.Dispose();$reader.Dispose()
        return $list
    }catch{
        throw $_.Exception.Message
    }
}
List-FTPFiles -url 'meinFTP' -username 'meinUser' -password 'meinpw'  

function Download-File([string]$url,[string]$path,$username,$password){
    try{
        $request = [System.Net.FtpWebRequest]::Create($url)
        $request.Method = [System.Net.WebRequestMethods+FTP]::DownloadFile
        $request.Credentials = New-Object System.Net.NetworkCredential($username,$password)
        $response = [System.Net.FtpWebResponse]$request.GetResponse()
        [System.IO.Stream]$stream = $response.GetResponseStream()
        [System.IO.FileStream]$outstream = New-Object System.IO.FileStream ($path,[System.IO.FileMode]::Create)
        $stream.CopyTo($outstream)
        $outstream.Close();$stream.Close();$response.Close()
        $stream.Dispose();$outstream.Dispose();$response.Dispose()
        return $true
    }catch{
        throw $_.Exception.Message
    }
}

# Variablen ------------------------
$username = 'meinUser'  
$password =  'meinpw'  
$remotefile = 'ftp://meinFTP/*.txt'  
$localfile = "C:\meinOrdner\"  
# ----------------------------------------

# Download file from FTP
Download-File -url $remotefile -path $localfile -username $username -password $password