I took a look at your DOCX file and found that the last save of the file was interrupted, so it's actually missing data. Here are the last ten lines of my attempt to extract the DOCX file (which is, as you've already found, a ZIP file in disguise) with
zip -FF Bio\ Exam.docx --out Bio\ Exam.zip:
copying: customXml/_rels/item1.xml.rels (174 bytes)
copying: [Content_Types].xml (1005 bytes)
copying: word/media/image184.png (4149718 bytes)
copying: word/media/image181.png (777760 bytes)
copying: word/media/image179.png (135904 bytes)
copying: word/media/image178.png (331403 bytes)
copying: word/media/image177.png (1040822 bytes)
zip warning: no end of stream entry found: word/media/image149.png
zip warning: rewinding and scanning for later entries
word/media/image149.png is an incomplete file that got truncated by the unexpected end of the DOCX file, and everything after it is lost, including the central directory that would be at the end, shown in purple here:
It's not possible to determine what files are missing because the list of the files (central directory) at the end of the ZIP archive was never written.
Knowing these facts, your best bet for recovery would be to write the files from the corrupted archive/document into a copy of your outdated backup. Hopefully, this turns into a coherent DOCX file.
To be clear, these are the steps I would try:
- Assuming your backup document is called
backup.docx, make a copy and name it
- Extract all the files you can from the truncated (corrupted)
Bio Exam.docx into a temporary folder.
- Add all of those extracted files into
reconstructed.zip, replacing any existing files.
- Try to open
reconstructed.docx to see if the document is usable.