#include <QApplication>
#include <QFileDialog>
#include <QTimer>
#include <QMimeDatabase>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QMimeDatabase db;
    QString filter = db.mimeTypeForName("text/plain").filterString();
    QFileDialog::getOpenFileName(nullptr, {}, {}, filter, nullptr, QFileDialog::Option::DontUseNativeDialog);
    return 0;
}