Active

Flag indicating whether or not the extension should be used.

DisplayName

Display name of the extension.

ExtensionType

Type of extension.

FileTypes

Comma separated list of file types the extension should process.

SafeMode

Flag indicating if the extension should be run in a separate process from the search process.

UniqueName

Globally unique name of the extension.

UseIFilter

Flag indicating whether or not the search engine should use a registered IFilter instead of the extension (if one is available).