What Was the Secret Code Name for Windows 95?
Every version of Windows has an internal codename used by Microsoft to refer to the project before a final name had been chosen. The 32bit protected mode kernel of Chicago (Windows 95) was codenamed Cougar and runs on top of Jaguar (Chicago kernel).
Windows 95 was released on August 24, 1995 and was a huge leap forward from the previous versions of Windows. During development it was also referred to as Windows 4.0