I recently had the occasion to need to get around the form protection in an MS Word file. Turns out it’s a pretty easy exploit, but the directions I found elsewhere on the internet didn’t quite do the job.

Here’s the trick:

1. Open the protected document, and save it as an .html file.
2. Close the .doc file, and open the .html file in a text editor such as notepad or GVIM
3. In the .html file, find a tag that says something like: "<w:UnprotectPassword>ABCDEF01</w:UnprotectPassword>"
4. Replace each of the characters in the tag with zeroes so it reads: "<w:UnprotectPassword>00000000</w:UnprotectPassword>"
5. Open the .html file in Word, and save it as a .doc. Go to Tools > Unprotect Document

That should do it. I’d love to hear any evidence to the contrary.