diff --git a/src/core/cartridge.ml b/src/core/cartridge.ml
index a0d908c..3a9dc11 100644
--- a/src/core/cartridge.ml
+++ b/src/core/cartridge.ml
@@ -67,6 +67,8 @@ let get_RAM_size = function
 
 
 let read_cartridge file =
+  Printf.printf "Read cartridge: %s" file;
+  print_newline ();
   try
     let ic = open_in_bin file in
 
diff --git a/src/core/cbindings.ml b/src/core/cbindings.ml
index 14dbf97..d08f928 100644
--- a/src/core/cbindings.ml
+++ b/src/core/cbindings.ml
@@ -1,3 +1,4 @@
 let () =
   Callback.register "oboy_name" Version.name;
   Callback.register "oboy_version" Version.version;
+  Callback.register "oboy_load" State.load_cartridge;
diff --git a/src/core/state.ml b/src/core/state.ml
index b017035..b40bace 100644
--- a/src/core/state.ml
+++ b/src/core/state.ml
@@ -1,9 +1,16 @@
 (* State of the world, contains all the required information at any point *)
 type t = {
-  cartridge : option Cartridge.t;
+  mutable cartridge : Cartridge.t option;
 }
 
 (* Global reference *)
 let state = ref {
   cartridge = None
 }
+
+let load_cartridge file =
+  let cartridge = Cartridge.read_cartridge file in
+  !state.cartridge <- cartridge;
+  match cartridge with
+  | Some _ -> true
+  | None -> false
diff --git a/src/qt/About.qml b/src/qt/About.qml
index 4b90dc4..59476ce 100644
--- a/src/qt/About.qml
+++ b/src/qt/About.qml
@@ -1,6 +1,5 @@
 import QtQuick 2.4
 import QtQuick.Window 2.0
-import com.oboy.oboy 1.0
 
 Window {
     id: window
@@ -12,10 +11,6 @@ Window {
     maximumHeight: height
     minimumHeight: height
 
-    OBoy {
-        id: oboy
-    }
-
     Text {
         id: name
         text: oboy.name
diff --git a/src/qt/main.qml b/src/qt/main.qml
index 1c60442..0f523b7 100644
--- a/src/qt/main.qml
+++ b/src/qt/main.qml
@@ -1,6 +1,7 @@
 import QtQuick 2.5
 import QtQuick.Controls 1.4
 import QtQuick.Dialogs 1.2
+import com.oboy.oboy 1.0
 
 ApplicationWindow {
     id: root
@@ -49,6 +50,10 @@ ApplicationWindow {
 
     }
 
+    OBoy {
+        id: oboy
+    }
+
     MainForm {
         anchors.fill: parent
         openButton.onClicked: fileDialog.open()
@@ -70,7 +75,8 @@ ApplicationWindow {
         title: "Please choose a file"
         folder: shortcuts.home
         onAccepted: {
-            console.log("You chose: " + fileDialog.fileUrls)
+            console.log("You chose: " + fileDialog.fileUrl)
+            oboy.load(fileDialog.fileUrl)
         }
         onRejected: {
             console.log("Canceled")
diff --git a/src/qt/oboy.cpp b/src/qt/oboy.cpp
index d02ac3e..d66a3b2 100644
--- a/src/qt/oboy.cpp
+++ b/src/qt/oboy.cpp
@@ -2,6 +2,9 @@
 
 #include <caml/mlvalues.h>
 #include <caml/callback.h>
+#include <caml/alloc.h>
+#include <caml/misc.h>
+#include <caml/osdeps.h>
 
 OBoy::OBoy(QObject *parent) : QObject(parent)
 {
@@ -29,3 +32,19 @@ QString OBoy::version() const
     const char *str = String_val(caml_callback(*closure_f, Val_unit));
     return QString(str);
 }
+
+bool OBoy::load(const QString &path)
+{
+    value * closure_f = caml_named_value("oboy_load");
+    if (closure_f == nullptr) {
+        return false;
+    }
+
+    QString truncated(path);
+    truncated.remove(0, 7); // remove file://
+    QByteArray ba = truncated.toLocal8Bit();
+    value ocaml_path = caml_copy_string_of_os(ba.data());
+
+    const bool success = Bool_val(caml_callback(*closure_f, ocaml_path));
+    return success;
+}
diff --git a/src/qt/oboy.h b/src/qt/oboy.h
index 804b71b..5a67932 100644
--- a/src/qt/oboy.h
+++ b/src/qt/oboy.h
@@ -5,11 +5,12 @@
 class OBoy : public QObject
 {
     Q_OBJECT
-    Q_PROPERTY(QString name READ name)
-    Q_PROPERTY(QString version READ version)
+    Q_PROPERTY(QString name READ name CONSTANT)
+    Q_PROPERTY(QString version READ version CONSTANT)
 public:
     explicit OBoy(QObject *parent = nullptr);
 
     QString name() const;
     QString version() const;
+    Q_INVOKABLE bool load(const QString &path);
 };