Answer:
In RFEM, it is possible to open and further edit structures with loads and load cases that have been modeled in RSTAB. This may be necessary, for example, if it is determined during the input that it makes sense to include surface elements such as wall panes in the existing RSTAB model.
In order to open an RSTAB file in RFEM, you have to change the file type in the "Open" dialog box either to File type RSTAB or All Files. In this way, you can display not only the RFEM files, but also all RSTAB files available in the selected directory (see the image). After opening the RSTAB file, you can save the model as an RFEM file and further edit it.
Please note that the printout reports or input data already created in add-on modules (for RFEM 5 and RSTAB 8) cannot be transferred.
Conversely, you can edit an RFEM file in RSTAB if you change the file type in the "Open" dialog box to File type RFEM or to All Files and open the file. As an alternative, you can rename the file extension *.rf6 to *.rs9 (or *.rf5 to *.rs8 for RFEM 5 and RSTAB 8). Also in this case, all printout reports are deleted. You should also note that only member objects are transferred to RSTAB. All surface elements are deleted.
