This error message can appear if the document you are attempting to open is corrupt. It is possible to recover a corrupt file or its content by using either the Recover Text converter (may require installation) or the Open and Repair feature.
The Open and Repair feature is available from the Open dialog. To open and attempt a repair, select the document using File | Open... and then navigate to the damaged file and click on it once. Instead of selecting the Open button at the bottom right of the dialog to open the file, select the down arrow to the right of the button and select Open and Repair from the resulting list. If the file can be recovered, it will open and display in the document work area.
The Recover Text converter, if installed, is available from the Open dialog and appears in the Files of type: drop down (to the left of the Cancel button). It appears in the drop down list as: Recover Text from Any File (*.*).
mở word lên/file/open/chọn file bị lỗi. sau đó trong nút lệnh open bạn nhấn vào dấu mũi tên sổ xuống bên cạnh và chọn là open and repair