using System; using System.IO; using Windows.Storage.Streams; public async void WriteBytesToFile() { // Path to file to write to string filePath = @"C:\temp\example.bin"; // Create buffer byte[] buffer = new byte[] { 0x01, 0x02, 0x03 }; // Open file to write to Stream stream = new FileStream(filePath, FileMode.Create); // Create DataWriter object using file stream DataWriter writer = new DataWriter(stream.AsOutputStream()); // Write bytes to buffer writer.WriteBytes(buffer); // Flush buffer to file await writer.StoreAsync(); // Dispose writer and stream writer.Dispose(); stream.Dispose(); }In this example, we create a buffer containing binary data we want to write to a file. We then create a file stream using the specified file path and pass it to a DataWriter object. We then use the WriteBytes method to write the binary data to the buffer. Finally, we call the StoreAsync method to flush the buffer and write the data to the file. The package library for this method is Windows.winmd.