| Active | Gets or sets the flag indicating whether or not the extension should be used. |
| DisplayName | Display name of the plug in. |
| ExtensionType | Type of plug in. |
| FileTypes | Gets or sets the comma separated list of file types the extension should process. |
| IsIFilterOnly | Flag indicating whether or not this plug in is an IFilter. |
| SafeMode | Gets or sets the flag indicating if the extension should be run in a separate process from the search process. |
| SearchBinary | Gets or sets the flag indicating whether or not the binary data of the file type should be searched if this plug in is not active. |
| UniqueName | Unique identifier for the plug in |
| UseIFilter | Gets or sets the flag indicating whether or not the search engine should use a registered IFilter instead of the extension (if one is available). |