Hi @mr108,
.RBF files are usually part of the uninstall process. I think it is created on the fly by the uninstaller. In this case it is a false positive by avast. It may be that this prevented a complete uninstall and left some items around.
Try disabling avast and then performing a repair install (install again and select repair) and see if that helps. If not, uninstall odrive again and then reinstall and see if the shell extensions show up.