diff --git a/isoimagewriter/mainwindow.cpp b/isoimagewriter/mainwindow.cpp
index 90b772d..9c659b4 100644
--- a/isoimagewriter/mainwindow.cpp
+++ b/isoimagewriter/mainwindow.cpp
@@ -1,62 +1,112 @@
 #include "mainwindow.h"
+#include "mainapplication.h"
+#include "common.h"
 
 #include <QLabel>
+#include <QAction>
 #include <QPushButton>
 #include <QVBoxLayout>
 #include <QHBoxLayout>
+#include <QFileDialog>
+#include <QMessageBox>
 #include <QStackedWidget>
+#include <KFormat>
 #include <KLocalizedString>
 
 MainWindow::MainWindow(QWidget *parent)
-    : QMainWindow(parent)
+    : QMainWindow(parent),
+      m_lastOpenedDir("")
 {
     setupUi();
+
+    m_lastOpenedDir = mApp->getInitialDir();
+    // TODO: Use ISO image from command line args
 }
 
 void MainWindow::setupUi()
 {
     QStackedWidget *stackedWidget = new QStackedWidget;
     stackedWidget->addWidget(createFormWidget());
 
     setCentralWidget(stackedWidget);
 }
 
 QWidget* MainWindow::createFormWidget()
 {    // Logo
     QLabel *logoLabel = new QLabel;
     logoLabel->setPixmap(QIcon::fromTheme("drive-removable-media").pixmap(QSize(50, 50)));
 
     QLabel *titleLabel = new QLabel;
     titleLabel->setTextFormat(Qt::RichText);
     titleLabel->setText("<h2 style='margin-bottom: 0;'>KDE ISO Image Writer</h2>"
                         "A quick and simple way to create a bootable USB drive.");
 
     QHBoxLayout *headerHBoxLayout = new QHBoxLayout;
     headerHBoxLayout->addWidget(logoLabel);
     headerHBoxLayout->addWidget(titleLabel);
 
     // Form
     m_isoImageLineEdit = new QLineEdit;
     m_isoImageLineEdit->setReadOnly(true);
     m_isoImageLineEdit->setPlaceholderText(i18n("Path to ISO image..."));
 
+    QAction *openIsoImageAction = m_isoImageLineEdit->addAction(
+        QIcon::fromTheme("folder-open"), QLineEdit::TrailingPosition);
+    connect(openIsoImageAction, &QAction::triggered, this, &MainWindow::openIsoImage);
+
     m_usbDriveComboBox = new QComboBox;
 
     QPushButton *createButton = new QPushButton(i18n("Create"));
 
     QVBoxLayout *mainVBoxLayout = new QVBoxLayout;
     mainVBoxLayout->addLayout(headerHBoxLayout);
     mainVBoxLayout->addSpacing(15);
     mainVBoxLayout->addWidget(new QLabel(i18n("Write this ISO image:")));
     mainVBoxLayout->addWidget(m_isoImageLineEdit);
     mainVBoxLayout->addSpacing(5);
     mainVBoxLayout->addWidget(new QLabel(i18n("To this USB drive:")));
     mainVBoxLayout->addWidget(m_usbDriveComboBox);
     mainVBoxLayout->addSpacing(15);
     mainVBoxLayout->addWidget(createButton, 0, Qt::AlignRight);
 
     QWidget *formWidget = new QWidget;
     formWidget->setLayout(mainVBoxLayout);
 
     return formWidget;
 }
+
+void MainWindow::openIsoImage()
+{
+    const QString filter = i18n("Disk Images (%1)", QString("*.iso *.bin *.img"))
+        + ";;" + i18n("All Files (%1)", QString("*"));
+    QString isoImagePath = QFileDialog::getOpenFileName(this, "", m_lastOpenedDir, 
+                                                        filter, nullptr,
+                                                        QFileDialog::ReadOnly);
+    if (!isoImagePath.isEmpty())
+    {
+        m_lastOpenedDir = isoImagePath.left(isoImagePath.lastIndexOf('/'));
+        preprocessIsoImage(isoImagePath);
+    }
+}
+
+void MainWindow::preprocessIsoImage(const QString& isoImagePath)
+{
+    QFile file(isoImagePath);
+    if (!file.open(QIODevice::ReadOnly))
+    {
+        QMessageBox::critical(this, "Error",
+                              i18n("Failed to open the image file:")
+                              + "\n" + QDir::toNativeSeparators(isoImagePath)
+                              + "\n" + file.errorString());
+        return;
+    }
+
+    m_isoImageSize = file.size();
+    m_isoImagePath = isoImagePath;
+    m_isoImageLineEdit->setText(QDir::toNativeSeparators(m_isoImagePath) + " ("
+                                + KFormat().formatByteSize(m_isoImageSize) + ")");
+
+    file.close();
+
+    // TODO: Verify ISO image
+}
diff --git a/isoimagewriter/mainwindow.h b/isoimagewriter/mainwindow.h
index 17e2bfa..49e27e9 100644
--- a/isoimagewriter/mainwindow.h
+++ b/isoimagewriter/mainwindow.h
@@ -1,21 +1,29 @@
 #ifndef MAINWINDOW_H
 #define MAINWINDOW_H
 
 #include <QMainWindow>
 #include <QLineEdit>
 #include <QComboBox>
 
 class MainWindow : public QMainWindow
 {
 public:
     MainWindow(QWidget *parent = nullptr);
 
 private:
     QLineEdit *m_isoImageLineEdit;
     QComboBox *m_usbDriveComboBox;
 
+    QString m_isoImagePath;
+    quint64 m_isoImageSize;
+    QString m_lastOpenedDir;
+
     void setupUi();
     QWidget* createFormWidget();
+    void preprocessIsoImage(const QString& isoImagePath);
+
+private slots:
+    void openIsoImage();
 };
 
 #endif // MAINWINDOW_H