Edit Office Document from SharePoint in IE8 64 bit version

Have you ever tried to open a Word document from a SharePoint 2007 document library using Internet Explorer 8 64 bit edition? Today I tried, because I am running a 64 bit Windows 7 edition.
Guess what, next message was shown:


So I tried also to open a Word document from a SharePoint 2010 document library in IE8 x64. Of course, it doesn't work either. Only the message was a bit different:


Oh, by the way, I am using Office 2007 SP2. I didn't try it with Office 2010 (not installed yet). Maybe that will work? I guess not, but I let you know.
Thanks Microsoft! :(

Update:

I read on technet that the IE8 64 is a so called Level 2 brower. According to Microsoft, Web browser support is divided into two levels: level 1 and level 2. Although administrative tasks on SharePoint sites are optimized for level 1 browsers, SharePoint Server 2010 also provides support for other browsers that are frequently used. To ensure that you have complete access to all functionality, we recommend that you use a level 1 browser for administrative tasks.

So it seems that editing a Word document from SharePoint is administrative task. In SharePoint it is called 'contribution'... do you follow it?

Read more at Microsoft Technet:
http://technet.microsoft.com/en-us/library/cc263526%28office.14%29.aspx