Walk a directory tree, check if docs are password protected, log ones that are?

I need to walk a series of directory trees, look at each file and log whether it's password-protected or not. For the .doc format, I can just point the unix "file" command at the trees and grep on "Security: 1", but that doesn't work for .docx, which just shows up as an archive.

I've found some vb that works by logging an error on bad passwords, but it's a horrible kludge and not reliable. I've also found lots of shady freeware/payware.

Anyone found (or paid for) something that works well?

Can't find anything :-(

There's a property - Document.HasPassword - which will tell you if the document has a password set but it only works on a document which is already open.

I know it's kludgy to just try and open the file and see if it fails but I can't see why this shouldn't be fairly robust - Skipping Password-Protected Documents in a Batch Process is an example of the kind of thing you can do.

Heh, that's the code I found :)