Answer
Report Archive is a special 'feature client' window rather than an ordinary Logical-Unit-backed window — you can confirm this by checking its address bar, which starts with the ifswin protocol rather than the standard ifsapf protocol used by regular windows, which is exactly why it has no normal System Info or data-source name to look up. To build a working RMB/custom jump into Report Archive from another window, use an ifswin:-protocol custom command/URL-type action instead of a standard data-source-based RMB link, since that protocol is specifically designed for jumping into feature-client windows like this one rather than ordinary LU-backed screens.