I installed three weeks ago for testing reasons LibreOffice into a just re-installed Vista PC, which had no MS Office installed. Then I brought several docx-documents from another computer where I have Office 2010 (Windows 8), worked with them and made also new documents, all saved to docx. Text, image snapshots, tables, internet text fragments via clipboard etc., quite normal working. Then I brought the documents back to the original computer and made some study. Most of the documents had difficulties, but not very serious.
After that I have had problems with Office Word files in my Windows 8 computer. When I have edited completely other documents and saved them, I occasionally find that Word cannot open them without fixing. This does not happen to all documents. And before my LibreOffice trial I had no problems with my Word files. To me it looks like the LibreOffice files brought something to my computer (Office software library?). I am now trying to examine the situation in more detail, but i am afraid I must uninstall Office totally and re-install it. - Of course, I have a very well protected and updated computer.