| foobar2000/columns_ui-sdk/buttons.h | Button API |
| foobar2000/columns_ui-sdk/columns_ui.h | Columns UI Definitions |
| foobar2000/columns_ui-sdk/imp_helper.h | User interface extension API helper |
| foobar2000/columns_ui-sdk/ui_extension.h | User interface extension API |
| foobar2000/columns_ui-sdk/visualisation.h | Visualisation Renderer API |
| foobar2000/columns_ui-sdk/win32_helpers.h | UTF-8 Win32 API wrappers |
| foobar2000/columns_ui-sdk/window.h | Splitter Window API |
| foobar2000/columns_ui-sdk/window_helper.h | Helpers to write a custom window class |
