If you create extensions for others users, you must package them according to the guidelines on the Adobe Exchange website (www.adobe.com/go/exchange) under the Help > How to Create an Extension category. After you have written and tested an extension in the Extension Manager, select File > Package Extension. After the extension is packaged, you can submit it to the Exchange from the Extension Manager by selecting File > Submit Extension.
The Adobe Extension Manager comes with Dreamweaver. Details about its use are available in its Help files and on the Adobe Exchange website.