Problem: Trying to open an Aspose produced .docx gives an “unreadable content” error. The file will still open up in MSWord but you have to click past warning messages. Interestingly enough, if you open the .docx as a zip file, which is what it is, and then unzip and rezip, then the .docx will open just fine in MSWord. Solution: Our code did a MailMerge followed by: WordTemplate.Save(out_ms, Aspose.Words.SaveFormat.Docx); Then we added an extra blank page and that code created another Aspose.Words.Document ......