When you save an image in Microsoft Internet Explorer, the image is saved by default as a bitmap (.bmp). You do not have the option to save the image by using an extension other than .bmp. You experience this behavior even when the image uses a different format (such as .gif or .jpeg).
For example, when you right-click an image on a Web page, and then click Save Picture As, the file name that appears in the File name box is Untitled, and the file type that appears in the Save as type box is Bitmap (*.bmp).
This behavior may occur if a damaged program file (for example, an ActiveX or Java object) is downloaded to the SystemRootDownloaded Program Files folder on your hard disk.