what is a pub file
The PUB Document file format. PUB is the file extension which is generally used by the Microsoft Publisher application which is a part of the Microsoft Office product set.This file format can comprise various objects such as graphics, images, formatted text, or any other kind of object.he PUB Document file format. PUB is the file extension which is generally used by the Microsoft Publisher application which is a part of the Microsoft Office product set.