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).
Ground glass opacities on chest x-rays may be due to inflammatory or infectious causes, and occasionally hemorrhage . You may have or previously had a process causing the ground glass appearance. If you are having any symptoms, consult your internist or pulmonologist.