Internet Feature Controls (M..R)

Updated: February 2011

This article describes feature controls with names that begin with the letter M, N, O, P, Q, or R. For links to other feature controls, see Feature Controls.

MIME Type Determination

Allow the process to determine a file's type by examining its bit signature. Windows Internet Explorer uses this information to determine how to render the file. The FEATURE_MIME_SNIFFING feature, when enabled, allows to be set differently for each security zone by using the URLACTION_FEATURE_MIME_SNIFFING URL action flag.

By default, this feature is enabled for Windows Internet Explorer and for applications hosting the WebBrowser Control. To disable this feature by using the registry, add the name of your executable file to the following setting.

HKEY_LOCAL_MACHINE (or HKEY_CURRENT_USER)
   SOFTWARE
      Microsoft
         Internet Explorer
            Main
               FeatureControl
                  FEATURE_MIME_SNIFFING
                     contoso.exe = (DWORD) 00000000

The feature is enabled when the value is set to (DWORD) 00000001 and disabled when the value is (DWORD) 00000000.

MIME Type Handling

Microsoft Internet Explorer 6 for Windows XP Service Pack 2 (SP2) and later. When the FEATURE_MIME_HANDLING feature control is enabled, Internet Explorer handles MIME types more securely:

  • The file extension given to a download file is based on the user's configuration, the values of the Content-Type and Content Disposition headers (if any), and the URL.

  • Internet Explorer will not automatically open downloaded files if the file extension is different from the file extensions supported by the registered application.

For more information, Handling MIME Types in Internet Explorer.

By default, this feature is enabled for Internet Explorer and disabled for applications hosting the WebBrowser Control. To enable this feature by using the registry, add the name of your executable file to the following setting.

HKEY_LOCAL_MACHINE (or HKEY_CURRENT_USER)
   SOFTWARE
      Microsoft
         Internet Explorer
            Main
               FeatureControl
                  FEATURE_MIME_HANDLING
                     contoso.exe = (DWORD) 00000001

The feature is enabled when the value is set to (DWORD) 00000001 and disabled when the value is (DWORD) 00000000.

MK Protocol Support

The FEATURE_DISABLE_MK_PROTOCOL feature blocks resources hosted on the "MK:" protocol, which is an obsolete mechanism for linking Windows Help files to webpages. When this feature control is disabled, the "MK:" protocol is enabled.

By default, this feature is enabled for Internet Explorer and for applications hosting the WebBrowser Control. To disable this feature by using the registry, add the name of your executable file to the following setting.

HKEY_LOCAL_MACHINE (or HKEY_CURRENT_USER)
   SOFTWARE
      Microsoft
         Internet Explorer
            Main
               FeatureControl
                  FEATURE_DISABLE_MK_PROTOCOL
                     contoso.exe = (DWORD) 00000000

The feature is enabled when the value is set to (DWORD) 00000001 and disabled when the value is (DWORD) 00000000.

Named Window Isolation

Windows Internet Explorer 8 and later. The FEATURE_ISOLATE_NAMED_WINDOWS feature prevents webpages hosted on one domain from manipulating named windows opened by webpages hosted on other domains. When this feature is disabled, named windows can be manipulated by other webpages, regardless of the domain they are hosted on.

By default, this feature is enabled for Internet Explorer and for applications hosting the WebBrowser Control. To disable this feature by using the registry, add the name of your executable file to the following setting.

HKEY_LOCAL_MACHINE (or HKEY_CURRENT_USER)
   SOFTWARE
      Microsoft
         Internet Explorer
            Main
               FeatureControl
                  FEATURE_ISOLATE_NAMED_WINDOWS
                     contoso.exe = (DWORD) 00000000

The feature is enabled when the value is set to (DWORD) 00000001 and disabled when the value is (DWORD) 00000000.

Note  Because this feature reverses a change designed to improve the security of Internet Explorer, disabling this feature is strongly discouraged.

Navigation Sound Support

Internet Explorer 8 and later. When enabled, the FEATURE_DISABLE_NAVIGATION_SOUNDS feature disables the sounds played when you open a link in a webpage.

By default, this feature is disabled for Internet Explorer and for applications hosting the WebBrowser Control. To enable this feature by using the registry, add the name of your executable file to the following setting.

HKEY_LOCAL_MACHINE (or HKEY_CURRENT_USER)
   SOFTWARE
      Microsoft
         Internet Explorer
            Main
               FeatureControl
                  FEATURE_DISABLE_NAVIGATION_SOUNDS
                     contoso.exe = (DWORD) 00000001

The feature is enabled when the value is set to (DWORD) 00000001 and disabled when the value is (DWORD) 00000000.

Protocol Lockdown

The FEATURE_PROTOCOL_LOCKDOWN feature applies the restrictions of the FEATURE_LOCALMACHINE_LOCKDOWN feature to specific protocols used in other zone contexts. For example, you can restrict HTML content from being loaded by the "shell:" protocol in the Internet zone. Because the shell protocol is designed primarily for the Local Machine zone, you can reduce the risk of malicious attacks from other zones. For more information, please see Security Considerations: URL Security Zones API.

By default, this feature is disabled for Internet Explorer and for applications hosting the WebBrowser Control. To enable this feature by using the registry, add the name of your executable file to the following setting.

HKEY_LOCAL_MACHINE (or HKEY_CURRENT_USER)
   SOFTWARE
      Microsoft
         Internet Explorer
            Main
               FeatureControl
                  FEATURE_PROTOCOL_LOCKDOWN
                     contoso.exe = (DWORD) 00000001

The feature is enabled when the value is set to (DWORD) 00000001 and disabled when the value is (DWORD) 00000000.

Resource Protocol Restriction

Internet Explorer 6 for Windows XP SP2 and later. When enabled, the FEATURE_RESTRICT_RES_TO_LMZ feature restricts the res: protocol to the Local Machine Zone.

By default, this feature is enabled for Internet Explorer and disabled for applications hosting the WebBrowser Control. To enable this feature by using the registry, add the name of your executable file to the following setting.

HKEY_LOCAL_MACHINE (or HKEY_CURRENT_USER)
   SOFTWARE
      Microsoft
         Internet Explorer
            Main
               FeatureControl
                  FEATURE_RESTRICT_ACTIVEXINSTALL
                     contoso.exe = (DWORD) 00000001

The feature is enabled when the value is set to (DWORD) 00000001 and disabled when the value is (DWORD) 00000000.

Related topics

Conceptual
Internet Feature Controls (A)
Internet Feature Controls (B..C)
Internet Feature Controls (D..H)
Internet Feature Controls (I..L)
Internet Feature Controls (S..T)
Internet Feature Controls (U..Y)
Internet Feature Controls (Z)
Obsolete Feature Controls
Feature Control Registry Index

 

 

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