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To transfer files from S3 to a folder in a Windows network directory using code, you can use the AWS SDK for .NET, which provides APIs to interact with AWS services. Here is a sample code in C# that demonstrates the process:

using System.IO;
using Amazon;
using Amazon.S3;
using Amazon.S3.Transfer;

// Set the source and destination locations
string sourceBucket = "my-source-bucket";
string sourceKey = "path/to/source/file.txt";
string destDirectory = @"\\network\directory";

// Create an S3 client
var s3Client = new AmazonS3Client();

// Retrieve the file from S3
var transferUtility = new TransferUtility(s3Client);
var sourceStream = new MemoryStream();
transferUtility.Download(sourceStream, sourceBucket, sourceKey);

// Save the file to the destination directory
var destPath = Path.Combine(destDirectory, Path.GetFileName(sourceKey));
using (var fileStream = new FileStream(destPath, FileMode.Create, FileAccess.Write))
{
    sourceStream.Seek(0, SeekOrigin.Begin);
    sourceStream.CopyTo(fileStream);
}

This code downloads the file from S3 using the TransferUtility class, which simplifies the process of transferring large files, and saves it to a local location using the FileStream class. The code assumes that the destination directory is a Windows network directory that can be accessed from the executing machine. Note that you need to ensure that the credentials for accessing the S3 bucket are properly configured.