You can use any of these methods to open recent Simulink® projects:
On the MATLAB® Home tab, click the Open arrow and select your project under the Recent Simulink Projects list.
From the Current Folder browser, double-click the .prj file.
On the Simulink Project tab, click the Open arrow and select your project under the Recent list.
For projects created or saved in Release 2012b or later, select Open > Open Project File. Browse and select your project .prj file.
For projects saved in Release 2012a or earlier, select Open > Open Project by Folder. Navigate to the folder containing the .SimulinkProject folder, and click OK to load the project. After you load this project once, then you can use Open Project File to open the project.
To open the Simulink Project:
From the MATLAB command line, enter:
From the Library Browser or Simulink Editor, select View > Simulink Project.