Stream Explorer will show you the number of streams in each file as they are listed per folder.
When you select a directory entry, Stream Explorer will list all the streams in that entry, and you can see their type, their size and contents. The unnamed stream is shown as
This version will show streams in folders as well, with thanks to Jürgen Gärtner for pointing out that folders can also contain streams.
WHAT ARE STREAMS?
The large majority of files on an NTFS disk will contain only one stream. The data that you normally deal with in the file is kept in that stream. It is called the unnamed stream.
But some files contain multiple streams.
The additional streams are named, like this: "c:\mydir\myfile.txt:mystream".
These streams can contain additional data, such as version information, author information, hard links, etc.