User may uncheck this option accidentally while downloading some files previously. To re-enable the option, please follow the steps below:

For Windows XP: (Assume the file type is "ppt")

  • Click "Start" -> "Program Files" -> "Windows Explorer".
  • Then click "Tools" -> "Folder Options".
  • Change to the "File Type" tabs.
  • Scroll down to locate the file type. Highlight "PPT Microsoft PowerPoint Presentation" and click the "Advanced" button.
  • Then check the option "confirm open after download".
  • Click "OK to confirm.