To transfer a help project file created using Adobe RoboHelp 10 to the Windows Server operating system, you can use a file transfer protocol (FTP) software like FileZilla to upload the files to the server. You may also need to consult with your server administrator to ensure that the necessary permissions are set up for the file transfer process. As for building the project file, you would follow the standard process of building the project in RoboHelp and then exporting it as a package or set of files to be uploaded to the server.