If you look at the definition for
] you will see that it has only the single signature: it takes an array of bytes as a parameter and outputs it to a new file.
Since an array of bytes is defined as a sequence of 8 bit unsigned binary data http://msdn.microsoft.com/en-us/library/e2ayt412(VS.71)
] it has no encoding, nor does it need one.
Any encoding change is performed when you convert a
to an array of bytes.