Iterating over all resources available in a program shows that there is a ":/qpdf" resource tree:

#include <QGuiApplication>
#include <QDebug>
int main(int argc, char **argv)
{
    QGuiApplication app(argc, cargv);
     qDebug() << QDir(":/").entryList();
}

prints

QList("qpdf", "qt-project.org")

Is there any reason to have :/qpdf at the top-level, and not move it below :/qt-project.org ?