Thank you for your post.
You can find the list of downloads here: Microsoft Flight Simulator X For Pilots: Real World Training | Computer Game Software | Computing | Subjects | Wiley
The specific download which contains the resource you mentioned is found in this .zip: https://media.wiley.com/product_ancillary/22/07645882/DOWNLOAD/FSX%20Files.zip
Please let me know if you have any questions. Have a great day!
How do I load these flights etc into flight sim X
The book should provide detailed instructions for loading these files.
The .FLT file extension is a file format used as part of saved game resources in Microsoft Flight Simulator X.
The .WX file is saved along with the .FLT file when creating a flight.
The .FSSAVE file is a saved game file created by Microsoft Flight Simulator X.
The .SPB file extension is affixed to saved Flight Simulator Mission Files.
I would recommend first extracting the contents of the zip folder to a different location. Then, double+click the FLT file, and this should launch Flight Sim X.
I hope this helps! Please let me know if you have any questions. Have a great week!