As far as I know it was given away when the coupon found in US Hollywood Records edition of the Another World album was sent to Hollywood Records. You can still find the original through record collector sites such as gemm.com (that's where I bought mine anyway).
And yes, it's 100% official :)
Three of four tracks are available for download on another Queen-related website. The tracks are excellent and it's a shame that they're not more easily available.
Wrong forum by the way.
V.