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).
It may show air or fluid in the pleural space. It also may show the cause (e.g., pneumonia, a fractured rib, or a lung tumor) of the pleurisy. Sometimes an x-ray is taken while lying on the painful side. This may show fluid, as well as changes in fluid position, that did not appear in the vertical x-ray.