You may need to set the MIME types for the QuickTime player.
STEPS
- Open your QuickTime Player. (From your desktop, go to the Start menu and select All Programs/QuickTime/QuickTime Player.)
- From the menu at the top left, select Edit/Preferences/QuickTime Preferences.
- At the top, click the Browser tab.
- At the bottom, click MIME Settings.
- Click the + sign to expand your list such as the list for Video.
- Select the file types you want to play such as AVI.
- Click OK.
- Click OK.