In Windows Vista

1. Click the Start button .
2. In Computer, open the folder containing files that you want to view.
3. On the Organize menu, click Folder and Search Options, and then click the View tab.
4. To view all hidden file types, click the Show hidden files and folders option.
5. To see all file name extensions, clear the Hide file extensions for known file types check box.
6. Click Apply.

In Microsoft Windows XP

1. In My Computer or Windows Explorer, open the folder containing files you want to view.
2. On the Tools menu, click Folder Options, and then click the View tab.
3. To view all hidden file types, click the Show hidden files and folders option.
4. To see all file name extensions, clear the Hide file extensions for known file types check box.
5. Click Apply.