Files stored in the UPD format are more commonly known as program update information files. These .upd files are text documents, and its content can be viewed by any text editing or word processing application. Users of Microsoft Windows-based systems can use the Microsoft Notepad application to open and edit these .upd text documents.
Croup (acute laryngotracheobronchitis) on X-ray with steeple sign. Croup, also called acute laryngotracheobronchitis is caused by viral infection of the upper airway usually parainfluenza virus or respiratory syncytial virus (RSV).
Chest x-rays may reveal hyperinflation of the lungs, indicated by flattening of the diaphragm and radiolucency of the lung fields. However, x-rays may appear normal until the emphysema component is quite advanced. Hematocrit levels may be elevated due to chronic hypoxia.