Vermilion OS 99

Vermilion OS 99 is a graphical operating system developed and manufactured by Finnish software development company Vermilion. It was released in 1999. 
===Features===
Terminal - Like Linux and Windows, Vermilion OS 99 had its own terminal. Like KDE named their terminal Konsole, they named theirs Verminal. It uses multiple languages such as Python, Bash, and their very own language, V++.
Linux Subsystem - Like Windows, Vermilion OS 99 has something called "Linux Vermilion Terminal" (LVT), an extension installed by using V++ code: 
directory \Users\user\Extensions
install new LVT