I've got a machine running Windows 2000 (up to SP2) and Office 2000.
When I receive an e-mail with a Word or Excel document attached I can't launch the attachment by double-clicking on it. If I do then get various different errors - sometime it immediately displays an error without even trying to load the appropriate application (i.e. Word) and other times it loads Word before giving an error message.
I managed to get round the problem by changing the File Association so that it didn't use DDE - and this works fine for Opening of documents. But - if you want to print a document by right clicking on the attachment and selecting Print then you have to use DDE for it to work.
I really don't understand why i'm having these problems on what is essentially a freshly installed machine.