All files are encoded in the Base64 encoding specified in RFC 2045 - MIME (Multipurpose Internet Mail Extensions).
The Base64 encoding is designed to represent arbitrary sequences of octets in a form that need not be humanly readable. A 65-character subset ([A-Za-z0-9+/=]) of US-ASCII is used, enabling 6 bits to be represented per printable character.
For more information please see http://tools.ietf.org/html/rfc2045 and http://en.wikipedia.org/wiki/Base64
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