I just did a clean install on my new SSD and moved all my files over before installing all my apps. So I had all my office files before I installed MS Office 2011, and after I installed office, the file thumbnails did not change from a blank page to a .docx, .pptx., or .xlsx icon, BUT my old .doc files display the correct thumbnail. I've attached a pic of what I am trying to explain. I've tried changing the default app of .docx files to Text Edit and back to Word, but that doesn't change anything. I've tried saving a new blank document to see if new files will display the correct thumbnail, but that does not work either. Does anybody know what I can do?