When saving a project to disk, the file that is written will have an aot extension (the prefix must contain at least three characters!) and is usually referred to as an ``AOT file''. This is actually a zip file that contains the various components of a project, including the XML descriptions of the proposal, project and SBs, as well as the PDF file that will have been attached to provide a scientific and technical justification. Therefore, it is possible to ``unzip'' an aot file to get at these individual components, but this should only ever be necessary for expert users. AOT files can be emailed to other people for viewing in the OT, but once a project has been submitted, a co-I can also retrieve it from the ALMA archive. Under no circumstances should a project be altered by editing the XML directly!