Your customer can look at the model using the "viewer". This program variant is set up automatically during the installation of RFEM 5 or RSTAB 8. It appears after the installation as an additional icon on the desktop (see the image). The viewer is included in the trial version, which can be downloaded by clicking the link below.
Thus if your client runs the program via the viewer icon, they can open your transmitted file with the results. In the viewer mode, no changes are possible.