As I can see here all five dump files don’t seem to be valid Windows crash dumps. They might be incomplete, compressed, or the wrong file type. Because of that, no system or crash info can be read from them.
You can try re-exporting proper minidumps using sysdm.cpl > Advanced > Startup and Recovery > Small memory dump (256 KB) or open them in WinDbg or BlueScreenView to confirm if there’s any real system issue. Don't make too big or over 400mb