I produced a simple program to display the output of QDir::entryInfoList() in a QTextEdit. I sent him versions of this program built with Qt 5.9.0 and Qt 5.12.2. He tested the two builds with a directory containing ten files, half of which had accents in the name. When he runs the Qt 5.9.0 build all ten files show up:

However, only six files are returned by QDir::entryInfoList() when he runs the Qt 5.12.2 build, and four of the files containing accents are missing:

This issue only happens on the user's computer. When I test on the Mac with the same ten files they all show up in all versions of Qt, as you can see in this screenshot. I wondered if it was an issue related to locale, so I changed my Region and Language to French, but I still couldn't recreate the problem.

The project for the test program can be downloaded here and the builds I used for testing are here. I'll paste the code for the test project below as well.

main.cpp

#include <QApplication>
#include "Dialog.h"

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    Dialog dialog;
    return app.exec();
}

Dialog.h

#ifndef DIALOG_H
#define DIALOG_H

#include <QDialog>
#include <QTextEdit>

class Dialog : public QDialog
{
    Q_OBJECT
private:
    QTextEdit* dirContents;

public:
    Dialog();

private slots:
    void OpenDir();

private:
    void ReadDir(QString path);
};

#endif // DIALOG_H

Dialog.cpp

#include <QtWidgets>
#include "Dialog.h"


Dialog::Dialog()
{
    dirContents = new QTextEdit(this);
    QPushButton* openDir = new QPushButton(tr("Open Directory"), this);
    QVBoxLayout* layout = new QVBoxLayout(this);
    layout->addWidget(dirContents);
    layout->addWidget(openDir);
    setLayout(layout);

    dirContents->setReadOnly(true);
    setWindowTitle(QString("Qt %1").arg(QT_VERSION_STR));
    connect(openDir, SIGNAL(clicked()), this, SLOT(OpenDir()));
    show();
}


void Dialog::OpenDir()
{
    QFileDialog fileDlg(this);
    fileDlg.setFileMode(QFileDialog::Directory);
    fileDlg.setOptions(QFileDialog::ShowDirsOnly);
    fileDlg.setWindowTitle(tr("Open Directory"));
    fileDlg.setDirectory(QDir::homePath());
    if (fileDlg.exec())
        ReadDir(fileDlg.selectedFiles().at(0));
}


void Dialog::ReadDir(QString path)
{
    QDir dir(path);
    dir.setFilter(QDir::AllEntries | QDir::NoDotAndDotDot);
    dir.setSorting(QDir::Name | QDir::DirsFirst | QDir::LocaleAware);
    QFileInfoList fileList = dir.entryInfoList();

    dirContents->clear();
    dirContents->append(QString("%1\nNum Files: %2\n").arg(QDir::toNativeSeparators(path)).arg(fileList.size()));

    QFileInfoList::const_iterator file;
    for (file = fileList.constBegin() ; file != fileList.constEnd() ; ++file)
        dirContents->append(file->fileName());
}

Can anyone suggest why files aren't showing up on the user's computer with Qt 5.10+? Is it something I'm doing wrong or is it likely a Qt problem?