Most proprietary DTP programs store data in binary file formats that can’t be read by most human beings. Some even encrypt their files to make sure that sure you can only access your work with their closed software. If such a file has been damaged, it’s close to impossible to repair it.
Scribus uses a radically different approach, because its file format is based on XML, i.e. it can be read and analyzed by using a simple text editor. This not only means that you can repair damaged files rather easily; you can even create your own Scribus files without access to Scribus!