Category: At least Internet Explorer 9.0

This policy setting specifies whether Internet Explorer plays media files that use alternative codecs and that require additional software. If you enable this policy setting Internet Explorer plays these files if the appropriate software is installed. If you disable this policy setting Internet Explorer does not play these files. If you do not configure this policy setting the user can change the “Enable alternative codecs in HTML5 media elements” setting on the Advanced tab in the Internet Options dialog box.

This policy setting allows you to revert to the Internet Explorer 8 behavior of allowing OnUnLoad script handlers to display UI during shutdown. This policy setting may be needed to fix compatibility problems with particular web applications. If you enable this policy setting OnUnLoad script handlers display UI during shutdown. If you disable or do not configure this policy setting OnUnLoad script handlers do not display UI during shutdown (default behavior in Internet Explorer 9).

In Internet Explorer 9 and Internet Explorer 10:This policy setting prevents users from deleting ActiveX Filtering and Tracking Protection data which includes the list of websites for which the user has chosen to disable ActiveX Filtering or Tracking Protection. In addition Tracking Protection data is also collected if users turn on the Personalized Tracking Protection List which blocks third-party items while the user is browsing. With at least Internet Explorer 11:This policy setting prevents users from deleting ActiveX Filtering data Tracking Protection data and Do Not Track exceptions stored for visited websites. This feature is available in the Delete Browsing History dialog box. If you enable this policy setting ActiveX Filtering Tracking Protection and Do Not Track data is preserved when the user clicks Delete. If you disable this policy setting ActiveX Filtering Tracking Protection and Do Not Track data is deleted when the user clicks Delete. If you don’t configure this policy setting users can turn this feature on and off determining whether to delete ActiveX Filtering Tracking Protection and Do Not Track data when clicking Delete.

This policy setting prevents the user from deleting his or her download history. This feature is available in the Delete Browsing History dialog box. If you enable this policy setting download history is preserved when the user clicks Delete. If you disable this policy setting download history is deleted when the user clicks Delete. If you do not configure this policy setting the user can choose whether to delete or preserve download history when he or she clicks Delete. If the “Prevent access to Delete Browsing History” policy setting is enabled this policy setting is enabled by default.

This policy setting controls the ActiveX Filtering feature for websites that are running ActiveX controls. The user can choose to turn off ActiveX Filtering for specific websites so that ActiveX controls can run properly. If you enable this policy setting ActiveX Filtering is enabled by default for the user. The user cannot turn off ActiveX Filtering although they may add per-site exceptions. If you disable or do not configure this policy setting ActiveX Filtering is not enabled by default for the user. The user can turn ActiveX Filtering on or off.