This article discusses the changes in Microsoft Internet Explorer 4.01. Because Microsoft Internet Explorer 4.01 Service Pack 1 has been released, Microsoft Internet Explorer 4.01 is no longer available for download from Microsoft's Web site.

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Internet Explorer 4.01 includes improved accessibility features and addresses some known issues with Internet Explorer 4.0.

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How to Obtain Internet Explorer 4.01

Internet Explorer 4.01 is included with Microsoft Windows NT 4.0 Option Pack. To determine which version of Internet Explorer you are currently using, please see the following article in the Microsoft Knowledge Base:

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Changes in Internet Explorer 4.01

Internet Explorer 4.01 (version 4.72.2106.8) includes the following changes to Internet Explorer 4.0 (version 4.71.1712.6):

•	The version number that is displayed when you click About Internet Explorer on the Help menu in Internet Explorer, or right-click the My Computer icon on the desktop and then click Properties, is 4.72.2106.8.
•	Cipher Strength (40-bit or 128-bit Enhanced Cryptographic Service Provider) is displayed when you click About Internet Explorer on the Help menu in Internet Explorer.
•	The Internet Explorer user agent strings are updated from "MSIE 4.0" to "MSIE 4.01." NOTE: The user agent string is used by Web sites to determine the capabilities of your browser.
•	Internet Explorer 4.01 Setup does not upgrade Internet Explorer 4.0 Platform Preview (Beta) releases. If you are currently running Platform Preview 1.0 (version 4.71.544) or Platform Preview 2.0 (version 4.71.1008.3), you must uninstall the Platform Preview release before you install Internet Explorer 4.01. For information about how to do so, please see the following articles in the Microsoft Knowledge Base: 170757 (http://support.microsoft.com/kb/170757/EN-US/) Uninstalling Internet Explorer 4.0 Platform Preview 2.0
•	If you are running Internet Explorer 4.01 in Browser Only mode, you are unable to install an earlier version of Internet Explorer. If you are running Internet Explorer 4.01 with the Windows Desktop Update component, you are unable to install an earlier version of Internet Explorer, and you receive a warning that states that an earlier version of Internet Explorer cannot be installed (Apps.hlp warning).
•	The channel bar (or channel band in Browser Only mode) is disabled by default in Windows NT 4.0. A "Show cahnnel bar at startup (if Active Desktop is off" check box appears under Browsing when you click Internet Options on the View menu, and then click the Advanced tab.
•	The warning you receive (Apps.hlp warning) when you attempt to reapply Windows NT 4.0 Service Pack 3 (SP3) after you install Internet Explorer 4.01 is updated with the correct text. For additional information about this issue, please see the following article in the Microsoft Knowledge Base: 174302 (http://support.microsoft.com/kb/174302/EN-US/) Errors Installing Service Pack 3 After Internet Explorer
•	If you move the Temporary Internet Files folder in Internet Explorer 4.0, cookies are left in the old folder and you do not receive a warning that your cached subscription content is about to be deleted. Both of these issues have been addressed in Internet Explorer 4.01. For more information about these issues, please see the following article in the Microsoft Knowledge Base: 172949 (http://support.microsoft.com/kb/172949/EN-US/) How to Change the Location of Temporary Internet Files
•	For more information about these issues, please see the following article in the Microsoft Knowledge Base: The default amount of disk space used by the Temporary Internet Files folder (cache) is increased to 3percent of your hard disk. Earlier versions of Internet Explorer use 2 percent of your hard disk for the Temporary Internet Files folder. NOTE: If you upgrade from Internet Explorer 3.x to Internet Explorer 4.01, your custom cache size settings are not retained, and the cache is set to 3 percent of your hard disk. If you specified custom cache size settings in Internet Explorer 4.0, those settings are preserved when you upgrade to Internet Explorer 4.01.
•	For more information about these issues, please see the following article in the Microsoft Knowledge Base: Internet Explorer 4.01 includes support for Microsoft Active Accessibility (MSAA) version 1.1. In addition, the following new accessibility options are available under Accessibility when you click Internet Options on the View menu in Internet Explorer, and then click the Advanced tab: • "Move system caret with focus/selection changes" This option specifies whether to move the system caret when the focus or selection changes. Some accessibility aids, such as screen readers or screen magnifiers, use the system caret to determine which area of the screen to read or magnify. • "Always expand alt text for images" This option specifies whether the image size should expand to fit all of the alternate text when the Show Pictures check box is cleared. For additional information about Internet Explorer 4.0 and 4.01 accessibility features, please visit the following Microsoft Web site: http://www.microsoft.com/enable/products/docs/default.aspx (http://www.microsoft.com/enable/products/docs/default.aspx)
•	For more information about these issues, please see the following article in the Microsoft Knowledge Base: The Internet Explorer 4.0 issues documented in the following Microsoft Knowledge Base articles are addressed in Internet Explorer 4.01:175039 (http://support.microsoft.com/kb/175039/EN-US/) Err Msg: A Connection to the Server Could Not Be Established 175133 (http://support.microsoft.com/kb/175133/EN-US/) Error Message: Unable to Install Java Packages... 176262 (http://support.microsoft.com/kb/176262/EN-US/) Err Msg: The Drive or Network Connection That the Shortcut... 174608 (http://support.microsoft.com/kb/174608/EN-US/) You receive an error message when you try to open Control Panel in Windows 95 174974 (http://support.microsoft.com/kb/174974/EN-US/) Cannot Edit Web Pages on Internet Using FrontPage Express 176667 (http://support.microsoft.com/kb/176667/EN-US/) "Installation Is Incomplete" Installing Internet Explorer 4.0 177064 (http://support.microsoft.com/kb/177064/EN-US/) Computer Hangs or Connect To Dialog Box Appears with Send Later 174376 (http://support.microsoft.com/kb/174376/EN-US/) Error Message: Couldn't Open File... 174887 (http://support.microsoft.com/kb/174887/EN-US/) Error Message: Exchng32 Caused an Invalid Page Fault... 176583 (http://support.microsoft.com/kb/176583/EN-US/) Double-Clicking Desktop Shortcut to Folder Does Not Work 174377 (http://support.microsoft.com/kb/174377/EN-US/) Dial-up Networking Stops Responding While Initializing the Modem 174714 (http://support.microsoft.com/kb/174714/EN-US/) Error Message: This Program Has Performed an Illegal Operation 177300 (http://support.microsoft.com/kb/177300/EN-US/) Error Message: The Server Threw an Exception... 174607 (http://support.microsoft.com/kb/174607/EN-US/) Margin Settings Not Saved in Internet Explorer 177073 (http://support.microsoft.com/kb/177073/EN-US/) Paste Command Missing When You Right-Click the Favorites Folder 175429 (http://support.microsoft.com/kb/175429/EN-US/) Internet Explorer May Not Start with a Local File Home Page 175775 (http://support.microsoft.com/kb/175775/EN-US/) Nothing Happens When You Click a Link in Internet Explorer 176446 (http://support.microsoft.com/kb/176446/EN-US/) "Fatal Exception 0E" Error Message Attempting to Open Folder 174486 (http://support.microsoft.com/kb/174486/EN-US/) Only Desktop Wallpaper Appears When You Start Your Computer NOTE: The problems associated with Compaq's CPQShell and changing folder options in a "rooted" instance of Windows Explorer (CabinetState issue) are both fixed in Internet Explorer 4.01. 175199 (http://support.microsoft.com/kb/175199/EN-US/) File Permissions Do Not Change After File Copy NOTE: In addition to changing the default behavior back to the Windows NT default when you copy a file (NTFS file system permissions are not copied with the file), Internet Explorer 4.01 provides a new registry value (ForceCopyAclwithFile) so you can revert to the Internet Explorer 4.0 default (NTFS file system permissions are copied with the file).

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