Hi
I found the following on a Microsoft Web Site:
CAUSE
There are two reasons for this behavior:
The default editor for the page is set to open in some other registered editor.
The TriEdit.dll is not correctly registered.
RESOLUTION
To resolve this problem, install Visual Studio 6.0 Service Pack 3.
Another option is to use the following steps to set the default back to the HTML editor that ships with Visual InterDev 6.0:
Right-click the HTML or ASP file.
Select Open With from the shortcut menu.
Click on the HTML Editor and select Set Default.
To re-register the TriEdit.dll, run the following command:
Regsvr32 <Path>\TRIEDIT.DLL
Where <path> is the fully qualified path to the TriEdit.dll
By default, the TriEdit.dll is located in the following location:
C:\Program Files\Common Files\Microsoft Shared\Triedit\TriEdit.dll
NOTE: If problems persist after performing the above steps, see Q-article Q270656 in References section.
MORE INFORMATION
In general, Visual InterDev 6.0 is not compatible with the Internet Explorer 5.0 Beta. Internet Explorer 5.0 Beta is not supported with Visual InterDev due to these and other problems.
I found this at...
Hope this helps =)