The answer is due to the fact that Google Chrome uses an SQLite file to save cookies. It resides under:
C:\Users\<your_username>\AppData\Local\Google\Chrome\User Data\Default\
inside Cookies
file. (which is an SQLite database file)
So it's not a file stored on hard drive but a row in an SQLite database file which can be read by a third party program such as: SQLite Database Browser
EDIT: Thanks to @Chexpir, it is also good to know that the values are stored encrypted.