Select the files to be saved (multi-selection is possible) in the attachments list and use the Message->Attachment->Save command, or Save to disk in the contextual menu. If several attachments are selected, a directory selector will appear. If only one attachment is selected, a filename and path selector will appear, so that it's possible to change the name of the file being saved. For each attachment with no predefined filename, the application will prompt for a filename before saving.