WebDAV editing is integrated into the the User contributions module, which brings WebDAV editing to the live site. If a document type used for user contributions contains a field of the File or Document attachment type, the Edit in client application () icon is displayed with files uploaded into these fields. Clicking the icon opens the document for editing in a client application (if there is an application for the particular file type installed on the client machine and if the application supports WebDAV).
For the icon to be displayed in the Contribution list or Edit contribution web parts, the Check permissions property of the web part needs to be enabled and the current user must have appropriate permissions to edit the document, as described in Modules -> User contributions -> Security. When using the Groups module versions of the web parts, the icon is displayed either under the same conditions as described above or when the current user is the administrator of the respective group.