How hard can it be? I upgraded to Office 2008 SP1 on my work laptop (I only use iWork on my home machine) and now I can't seem to open Microsoft Office documents that have been emailed to me. How could they break this? Well, long story, and I'm actually more interested in fixing it. So, following these steps did it for me:
* Download MisFox, then double-click on "MisFox.prefPane" to install
* In the MisFox system preferences pane pick the File Mappings tab
* Scroll down the list till you find "Word Document" and the .doc file extension
* Double click on that line to open the editor
* Set the Creator Code to MSWD and the File Type to W8BN
* Check "Resource Fork is Significant"
* Repeat last steps for Excel, setting the code to XCEL and the type XLS8
* Repeat for Powerpoint, setting the code to PPT3 and the type to SLD8
Thanks to my colleagues at ThoughtWorks for figuring this out.