add import dialog on windows

engine/main.cpp

@@ -81,6 +81,26 @@ void async_unlock()
     }
 }
 
+std::string win32_open_file()
+{
+    OPENFILENAMEA ofn;
+    char fileName[MAX_PATH] = "";
+    ZeroMemory(&ofn, sizeof(ofn));
+    ofn.lStructSize = sizeof(OPENFILENAME);
+    ofn.hwndOwner = hWnd;
+    ofn.lpstrFilter = "Image Files (*.jpg, *.png)\0*.jpg;*.png";
+    ofn.lpstrFile = fileName;
+    ofn.nMaxFile = MAX_PATH;
+    ofn.Flags = OFN_EXPLORER | OFN_FILEMUSTEXIST | OFN_HIDEREADONLY;
+    ofn.lpstrDefExt = "";
+    ofn.lpstrInitialDir = "Missions\\";
+    if (GetOpenFileNameA(&ofn) != NULL)
+    {
+        return fileName;
+    }
+    return "";
+}
+
 struct async_locker
 {
     async_locker() { async_lock(); }