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PUB file format

File extension.pub
File categorydocuments
Main programMicrosoft Publisher
DescriptionPUB is the file extension engaged by the Microsoft Publisher application; this application is an integral part of the Microsoft Office product set. PUB file format comprises objects like images, graphics, formatted text, or any other object type. However, these file types are employed for amateur publishing, while professionals use higher-end file types.
Technical detailsMicrosoft Publisher files come with elements like graphics, images, formatted text, and objects. Revisions have been done to the file extension, version 3.0 for Windows 95 to the new version 14 used by Microsoft Publisher 2010. A setback is that it’s not portable and does not work with other applications like Microsoft Word. So, this file type is not good for sharing with others. So, with the trial version of Microsoft Publisher, it is possible to view the .pub files.
MIME type
application/x-mspublisher