CubicExplorer is described by its author as
CubicExplorer is a file manager which is aimed to replace Windows Explorer. It’s goal is to be easy and pleasant to use but still have enough power for more advanced usage.
CubicExplorer has an uncluttered interface with a relatively limited amount of features. It manages to give a clean look impression to the user and remains easy enough for simple use. It has the usual and needed features in the ability to set bookmarks and remember folders. Filters to show only certain files types within folders. A quick view for internal image previews