I just had a case open with them on this issue and their solution was to install a 32 bit instance of SQL and via linked server call a proc to run the openrowset.

I guess I should know better, but I was shocked M.S. pulled this one.

After I questioned the suport staff a bit they researched and said that their would be 64 bit text/excel drivers at some point. The next version of Office is supposed to come in both 32 and 64 bit flavors, so I guess we should get 64 bit drivers as it approaches or at least when it is released.