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    <p>Here is a version for C#</p> <pre><code>using System.Runtime.InteropServices; class Program { static void Main(string[] args) { var mainStream = NativeMethods.CreateFileW( "testfile", NativeConstants.GENERIC_WRITE, NativeConstants.FILE_SHARE_WRITE, IntPtr.Zero, NativeConstants.OPEN_ALWAYS, 0, IntPtr.Zero); var stream = NativeMethods.CreateFileW( "testfile:stream", NativeConstants.GENERIC_WRITE, NativeConstants.FILE_SHARE_WRITE, IntPtr.Zero, NativeConstants.OPEN_ALWAYS, 0, IntPtr.Zero); } } public partial class NativeMethods { /// Return Type: HANDLE-&gt;void* ///lpFileName: LPCWSTR-&gt;WCHAR* ///dwDesiredAccess: DWORD-&gt;unsigned int ///dwShareMode: DWORD-&gt;unsigned int ///lpSecurityAttributes: LPSECURITY_ATTRIBUTES-&gt;_SECURITY_ATTRIBUTES* ///dwCreationDisposition: DWORD-&gt;unsigned int ///dwFlagsAndAttributes: DWORD-&gt;unsigned int ///hTemplateFile: HANDLE-&gt;void* [DllImportAttribute("kernel32.dll", EntryPoint = "CreateFileW")] public static extern System.IntPtr CreateFileW( [InAttribute()] [MarshalAsAttribute(UnmanagedType.LPWStr)] string lpFileName, uint dwDesiredAccess, uint dwShareMode, [InAttribute()] System.IntPtr lpSecurityAttributes, uint dwCreationDisposition, uint dwFlagsAndAttributes, [InAttribute()] System.IntPtr hTemplateFile ); } public partial class NativeConstants { /// GENERIC_WRITE -&gt; (0x40000000L) public const int GENERIC_WRITE = 1073741824; /// FILE_SHARE_DELETE -&gt; 0x00000004 public const int FILE_SHARE_DELETE = 4; /// FILE_SHARE_WRITE -&gt; 0x00000002 public const int FILE_SHARE_WRITE = 2; /// FILE_SHARE_READ -&gt; 0x00000001 public const int FILE_SHARE_READ = 1; /// OPEN_ALWAYS -&gt; 4 public const int OPEN_ALWAYS = 4; } </code></pre>
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    1. COShould be using a type derived from SafeHandle here, to ensure you clean up those file handles.
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    2. COYou showed how to use the native APIs, but not how to use the pointer returned from `CreateFileW`. I'd *really* like to see a more complete sample that writes to the common properties available in the Summary tab of file properties in Windows Explorer.
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