KIO::DirectorySizeJob always returns 0 on Windows. STEPS TO REPRODUCE KIO::DirectorySizeJob *job = KIO::directorySize(path); connect(job, &KJob::result, this, [job]() { qDebug()<<"GOT FOLDER SIZE: "<<job->totalSize(); job->deleteLater(); }); While this works correctly on Linux, it always returns 0 on Windows. OBSERVED RESULT EXPECTED RESULT SOFTWARE/OS VERSIONS Windows: macOS: (available in the Info Center app, or by running `kinfo` in a terminal window) Linux/KDE Plasma: KDE Plasma Version: KDE Frameworks Version: Qt Version: ADDITIONAL INFORMATION