Many Windows applications can export or save to WMF files. WMF stands for "Windows Meta File" and is a vector and bitmap graphics format. Unfortunately, this format is only really common on the Windows platform. Hence this utility is able to take a WMF file and export it to PDF enabling MacOS-X applications to render and use the drawings and images. It's also able to export to EPS as well.
There are some limitations in this conversion process due to the disparity between the methodologies behind WMF and PDF respectively. If you have any difficulty converting your WMFs, we would like to hear from you -- ensure that you can build a test case that is less than 256 kilobytes in size and get in touch with us.
OK, so you want to stamp your document. Maybe you need to give reviewers some advice about the document's status or sensitivity. This tip from author Ted Padova demonstrates how to add stamps with the Stamp Tool along with related comments.