In layman's terms... NTFS file system allows for file to be associated with more than one file stream. Streams other than the main are called Alternate Data Streams. Normally the users on Windows systems aren't aware of them because windows explorer can't show them. They aren't meant to be seen and have purpose of carrying additional information about the file they are "attached" to. For example if you download something from internet and try to run it, by default you should have shell window p