When we want to use the file dialog box in the interface, we can use the FileDialog component with the following code:

import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick.Dialogs 1.3

Window {
    visible: true
    width: 640
    height: 480
    title: qsTr("")
    
    Button {
        id:openFile
        text: qsTr("Open the Files")
        backgroundDefaultColor: "#5A6268"
        onClicked:  {
            fileDialog.open()
        }
    }

    FileDialog {
        id: fileDialog
        title: qsTr("Please choose a file")
        nameFilters: ["Photo Files", "Image Files (*.jpg *.png *.gif *.bmp *.ico)", "*.*"]
        onAccepted: {
            _filePath.text = String(fileUrl)
            var filepath = new String(fileUrl)
        }
    }
}

Error Message:

file:///D:/Qt/Qt5.12.6/5.12.6/msvc2017_64/qml/QtQuick/Dialogs/DefaultFileDialog.qml:102:33: QML Settings: Failed to initialize QSettings instance. Status code is: 1
file:///D:/Qt/Qt5.12.6/5.12.6/msvc2017_64/qml/QtQuick/Dialogs/DefaultFileDialog.qml:102:33: QML Settings: The following application identifiers have not been set: QVector("organizationName", "organizationDomain")

Solution:
Add a line of code to the main function of main.cpp.

QCoreApplication::setOrganizationName("appName.org");//appName.org can be set at will