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Run unknown or unsigned ActiveX controls

Microsoft Expression Web recognizes the ActiveX controls that run Windows Media and Flash SWF files. When you open a page that contains any other type of ActiveX control, Expression Web prompts you for permission to run the control.

An ActiveX control that is unsigned does not have a valid digital signature. By default and for your security, Expression Web does not run unsigned ActiveX controls and does not prompt you for permission to run them. If you want the option to run an unsigned ActiveX control, you can set security options to enable Expression Web to prompt you for that permission.

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Don't run an unknown or unsigned ActiveX control unless you absolutely trust the publisher that created the control. For information, see Security and ActiveX controls overview.

After you enable Expression Web to run an unknown or unsigned ActiveX control, you can preview the associated media in the Design view of a page, and you can set properties provided by the control. If you do not enable Expression Web to run a control, the associated media appears as a grey box in Design view and only HTML properties are available for editing. When you open a different document that contains the same ActiveX control or open the same document a different time, you are prompted again for permission to run the control unless you enabled Expression Web to always trust that particular control.

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If an ActiveX control isn't installed on your system, Expression Web cannot run that control, and won't prompt you for permission to run the control.

To enable Expression Web to run an unknown ActiveX control

  1. Do one of the following:

    • Open a web page that contains media that requires an unknown ActiveX control.

    • In the Code view of a page, add the code for media that requires an unknown ActiveX control.

  2. In the Expression Web dialog box, optionally, to prevent this dialog from appearing when you open a page that contains this ActiveX control in Expression Web, select Always trust and display this ActiveX control.

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    If you select this option, you must click Yes in the next step in order for the option to work.

  3. In the Expression Web dialog box, do one of the following:

    • To run the control, click Yes.

    • To not run the control click No.

    Expression Web does not prompt you for permission to run unsigned ActiveX controls by default.

To enable Expression Web to run an unsigned ActiveX control

  1. On the Tools menu, click Page Editor Options.

  2. In the Page Editor Options dialog, click the General tab.

  3. Under Security Options, select Prompt for unsigned ActiveX controls.

    For information, see Set security options for ActiveX controls.

  4. Follow the procedure "To enable Expression Web to run an unknown ActiveX control".

To clear the list of ActiveX controls you set Expression Web to always trust

  1. On the Tools menu, click Page Editor Options.

  2. In the Page Editor Options dialog, click the General tab.

  3. Under Security Options,click Clear ActiveX Security Settings.

    For more information, see Set security options for ActiveX controls.e

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