| Class | Description |
 | AutoLoadAttribute | Represents an attribute indicating whether the class will be loaded automatically. This class cannot be inherited. |
 | ChunkedMemoryStream | Creates a stream whose backing store is memory. This class cannot be inherited. |
 | CustomDocumentProperties | |
 | DocumentProperty | Represents a custom or built-in document property of a container document. This class cannot be inherited. |
 | ReturnEventArgs<T> | Provides data for the Return event. |
 | Theme | Represents a spreadsheet theme. This class cannot be inherited. |
 | ThemeColorScheme | An interface used to defines a set of colors which are referenced to as a color scheme. The color scheme is responsible for defining a list a twelve colors. The twelve colors consist of six accent colors, two dark colors, two light colors and a color for each of a hyperlink and followed hyperlink. This class cannot be inherited. |
 | ThemeEffectScheme | Represents the effects scheme of a theme. This class cannot be inherited. |
 | ThemeFonts | This element defines the set of fonts which are to be used under different languages or locals. |
 | ThemeFontScheme | Represents the font scheme within the theme. The font scheme consists of a pair of major and minor fonts for which to used in a document. This class cannot be inherited. |
| Structure | Description |
 | ColorTransform | Represents the color transform. |
 | SchemeColor | Represents a scheme color. |
 | TextFont | This element specifies that an East Asian(or Latin or complex) font be used for a specific run of text. This font is specified with a typeface attribute much like the others but is specifically classified as an East Asian(or Latin or complex) font. |