This folder should contains a PixelFarm source.
That is auto-generated lib.
like these pictures...
pic 1: auto gen source from PixelFarm project
pic 2: detail
You can build the PixelFarm by your own.
(from https://github.com/PaintLab/PixelFarm/commit/718fa24bc6cf575560ccf68b7e34c768dde7c007)
or build from src snap shot at https://github.com/prepare/kneadium_release_tmp
(download ... PixelFarm_for_HtmlRenderer.7z and extract to the folder as the pictures above)