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When a Microsoft Word ".docx" File contains a hyperlink to another file, it will run the first file it finds in that directory with a valid extension. But will present to the end user an extension-less file in its Security warning dialog box without showing the extension type. If another "empty" file of the same name as the target executable exists but has no file extension. Because the extension is suppressed it makes the file seem harmless and the file can be masked to appear as just a folder etc. This can potentially trick user into running unexpected code, but will only work when you have an additional file of same name with NO extension on it. View the full article