Resolution: - The registry fix for this issue is already provided in the KB 973904. Following solution is the updated solution which is provided by Microsoft Word Team. You can use the following steps for the resolution.
WARNING : If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
To resolve this issue, an affected user can unregister the mswrd632 converter by editing the registry as follows:
Click Start, click Run, type regedit, and then click OK.
Locate and then click the following registry subkey:
HKEY_LOCAL_MACHINESOFTWAREMicrosoftShared Tools
Text ConvertersImportMSWord6.wpc
On the Edit menu, click Delete.
Click Yes.
Exit Registry Editor.
This change will effectively unregister the converter and disable it for third-party applications and for Microsoft Office. Microsoft Office will use its own text converters to open these kinds of files.
In case you want to re-enable the converter, you can add an AllowConversion registry entry with a DWORD value of 1. After you set this registry key value to 1, third-party applications can load the Word 6.0/95 for Windows and Macintosh to RTF converter. Please be aware that setting this registry key removes the protection that was added by this security update. Therefore, it should be done only when you trust the source of the files that are loaded by this converter. You can also disable this converter by setting the registry key value to 0.
To do this, follow these steps:
Click Start, click Run, type regedit, and then click OK.
Locate and then click the following registry subkey. Or, create it if it is not present.
For 32-bit versions of Windows
HKEY_LOCAL_MACHINESoftwareMicrosoftWindows
CurrentVersionAppletsWordpad
For Microsoft Windows on Windows 64 (WOW) mode
HKEY_LOCAL_MACHINESoftwareWow6432Nodemicrosoft
WindowsCurrentVersionAppletsWordpad
On the Edit menu, point to New, and then click DWORD Value.
Type AllowConversion for the name of the DWORD, and then press ENTER.
Right-click AllowConversion, and then click Modify.