In a previous life, all of our Quality documents were Word documents
EditByBSEditor: In a previous life, all of our Quality documents were Word documents which needed to be password protected to Filling In Forms Only using Words document Protection functionality. I was tasked with changing this password...for all 500+ documents on the server. So, I wrote a C# application to loop through all .doc(x) files and do this for me :p.

Of course, the real usefulness is that you can bulk reset properties of Word documents fairly easily. For now, it just works with document protection, but you could mass modify any number of document properties with only a few more lines of code and some more options in the GUI.

It would probably be possible to do this with Excel documents as well, but Ive never had the need to check it out...yet. you can free download Bulk Word Protection now.