Как проверить у файла наличие защиты?

using System.Runtime.InteropServices;
using Microsoft.Win32.SafeHandles;
 
public static class FileStreamHelper
{
    public static FileStream OpenFileWithStream(string fileName, string streamName, FileMode mode, FileAccess access)
    {
        return OpenFileWithStream(fileName, streamName, mode, access, FileShare.None);
    }
    
    public static FileStream OpenFileWithStream(string fileName, string streamName, FileMode mode, FileAccess access, FileShare share)
    {
        uint desiredAccess = (access & FileAccess.Read) == FileAccess.Read ? GenericRead : 0;
        desiredAccess |= (access & FileAccess.Write) == FileAccess.Write ? GenericWrite : 0;
        
        SafeFileHandle fileHandle = CreateFile(
            fileName + ":" + streamName,
            desiredAccess,
            share,
            IntPtr.Zero,
            mode,
            FileAttributes.Normal,
            IntPtr.Zero
        );
        if (fileHandle.IsInvalid)
        {
            int win32error = Marshal.GetLastWin32Error();
            Marshal.ThrowExceptionForHR(win32error);
            switch(win32error)
            {
                case 2:
                    throw new FileNotFoundException("Failed to open file with specified stream", fileName + ":" + streamName);
                default:
                    throw new IOException("Failed to open file with specified stream");
            }
        }
        return new FileStream(fileHandle, access);
    }
 
    const uint GenericRead = 0x80000000;
    const uint GenericWrite = 0x40000000;
    const uint GenericReadWrite = GenericRead | GenericWrite;
 
    [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    static extern SafeFileHandle CreateFile(
        string fileName,
        uint desiredAccess,
        [MarshalAs(UnmanagedType.U4)] FileShare share,
        IntPtr lpSecurityAttributes,
        [MarshalAs(UnmanagedType.U4)] FileMode creationDisposition,
        [MarshalAs(UnmanagedType.U4)] FileAttributes flagsAndAttributes,
        IntPtr hTemplateFile
    );
}