Once I worked for a company that got a quote in the form of a Word document. Turned out it had history turned on and quotes to competitors could be recovered.

There is a lot of incompitence when it comes to file formats.

For one of my first jobs I negotiated a better offer because "strings" on the document revealed the previous offer they'd sent out, and made me confident I could ask for more.

Though, makes me wonder if someone has intentionally sent out offers like that with lower numbers to make people think they're outsmarting them.