welcome to GD.SE!
What you are seeing is actually an illustration. You can tell it's not a font not only because of the formats (.ai and .eps), but because of the colors. Fonts are a just a set of shapes, so they can only have one color.
There is no easy way of converting graphics into a font (you could create a font using those graphics, but it would take a long time, and you only have those 4 characters).
There are, however, some other fonts that use flowers. A couple of examples:
Alpha Flowers (DaFont - Free)
Vtks Flowers (DaFont - Free)