Hi all,
I was unable open the source code for chapter 5.
Does anyone facing the same problem?

Chapter 05 contains three solutions.
Not sure if your'e not able to open any of them?

Myself I had issues extracting the .zip files by right-clicking the files and using "Extract all.." (I'm using Windows 8.1).
I ended up with downloading and installing 7-zip which is a free third-party software for compressing/extracting files and folders.

Thank you Cryotic.
That solved my problem.

Similar with you, I also is a Windows 8.1 user.
By default, it offer me winrar to open those zip files.
For your information, I was able to open some of the zip files.
Just that got few files I was unable to open especially those files after chapter 7.