Before you build a program, the project associated with it must be open. Only one project can be open at a time. Before you create a new project or open an existing project, you must close the current project.
·To open an existing project:
1.From the Project menu, choose Open.
2.From the file list, select a project file with the .MAK extension.
3.Choose OK.
·To close a project:
From the Project menu, choose Close.
Or open another project.
Or quit the Graphical Development Environment.