That's why I was surprised I couldn't open these .doc files with Word 2011. I tried to open some different .doc files with Word 2011 and was able to do so. I think you are correct that they might be corrupt. Since these files are important, however, I decided to try one other possible solution, and I was able to open them with LibreOffice. I'll try LibreOffice with additional files before I conclude it's the answer. (BTW, the files in question were Word 97 files. These documents were formatted as forms in which most of the text was typed into fill-in text fields. So, you also might be correct that at least part of these documents are protected.) I check into that some more. Thanks for your reply.