Final answer:
Adding ":pdf" to a search query will not limit the search to Microsoft Word documents but to PDF files. To search for Word documents, ":doc" or ":docx" should be used instead. The statement is false.
Step-by-step explanation:
The statement that adding ":pdf" to a keyword will limit the search to Microsoft Word documents is false. In fact, ":pdf" is used to refine searches to find PDF files, which are a different format than Microsoft Word documents (.doc or .docx). To specifically search for Word documents, you would use ":doc" or ":docx" in your search query along with the keyword. The :pdf extension specifically refers to Portable Document Format (PDF) files which are a different file type than Microsoft Word documents.