When I downloaded it, it is titled "financial engineering with mathemtica". But it is not a book.

Instead, they are 6 papers explaining in details how to use mathematica to model

(1) Binomial Term Structure Model

(2) Black-Scholes and Exotic Option Models

(3) Dynamic Hedging Strategies

(4) Term Structure of Interest Rate Models

(5) Binomial Option Pricing Models

(6) Value at Risk