Actually, there may be another good reason to paste images in Word or OpenOffice's Writer application (OpenOffice's equivalent of Word). Writer is capable to read Word documents, and can export to PDF, contrary to Microsoft Word.
I wasn't aware of this, but since I installed OpenOffice next to Microsoft Office, and discovered this facility, I regularily use it. Very handy for creating PDFs to share here on APUG or on a personal website. You can even set a security password, to disallow editing, copying and/or printing of the PDF's content.