I can't download Word or Excel attachments in Mail. Microsoft Answers can't help

have you tried uninstalling and reintalling office?

drag the office folder to the trash

alexmkbb wrote:

This had occurred to me but I can't see how to uninstall Office on Mac.

How to completely remove Office for Mac 2011

Now having given that link you never said which version of office you are using.

To sum up, you can open any Word or Excel doc using the Open command from Word or Excel, but you cannot do that from Finder or other apps. The error indicates that a required code library could not be found, which means that one or more files are not where the OS expects them to be; but the files do exist, otherwise you couldn't run Word at all.

Here's something to try. In Finder, Get Info on a Word file, go to Open with, choose Other… from pop-up menu, and navigate to your current copy of Word. Close the Get Info window, then try again to open the file by double clicking in Finder. If it works, do it again on another Word doc, but this time also click the Change All button. Repeat for Excel.

However, it may not work, and the best solution overall may be to re-install MS Office, because it sounds like you damaged somehow your current installation.