public static FileStream OpenFileStream(string fileName, FileMode fileMode, FileAccess fileAccess, FileShare fileShare)
{
if (fileName.Length <= 260)
{
return(new FileStream(fileName, fileMode, fileAccess));
}
var handle = CreateFile(
@"\\?\" + fileName,
fileAccess.Convert(),
fileShare.Convert(),
IntPtr.Zero,
fileMode.Convert(),
0, IntPtr.Zero);
var stream = new FileStream(handle, fileAccess);
if (fileMode == FileMode.Append)
{
stream.Seek(0, SeekOrigin.End);
}
return(stream);
}