Miku Hatsune Imitation version 2 (イミテーションｖ1ミク) is only available in .pmx format.
dl15688 (イミテーションｖ1ミク 2.00
The model has a wide range of expressions. Expressions include, but are not limited to, hair length, hair width, hair color alteration, making the model look mature or childish, opening the shirt, expanding or shrinking her breasts, and so on.
The model bears some resemblance to Animasa's Miku. This may be the reason why it is called Imitation Miku Hatsune.
The Ver 2 "Variable" update has many new features added to his model. New Expressions include more hair sizes, bikinis, wetsuits, underwear, dresses, and many more. There is also a much wider variety of color palletes to choose from.