Answer:
To access the Viewer again, you only need to create a new shortcut on the desktop and enter the following parameters:
- For RFEM 5.26: "C:\Program Files\Dlubal\RFEM 5.26\RFEM64.exe" /Viewer
- For RSTAB 8.26: "C:\Program Files\Dlubal\RSTAB 8.26\RSTAB64.exe" /Viewer
The existing program link can also be copied and supplemented with the addition /Viewer.