Bobs Cypher test

Right, before being an amazing radio presenter here on Sid Valley Radio. I (bob) was a Cryptologist and wrote software to encrypt and decrypt data along with hardware encryption devices.
So I have decided to give you a small test and below is a small test file with a message about wining some money. Now the key you will need is buried in the website so best fighting trousers on...

If you want a bigger challenge there is link to a larger file below...

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