The term filename extension is identified in base64 scheme by the sequence ZmlsZW5hbWUgZXh0ZW5zaW9u, while the MD5 signature is equal to 9e9fe939501e9d0929af053bbd64d068. The ASCII encoding of filename extension in hexadecimal notation is 66696c656e616d6520657874656e73696f6e.