Which MIME types are related to file extension ".pub"?

The .pub file extension is associated with 5 MIME types:

application/x-mspublisher, application/pgp, application/octet-stream, application/pgp-keys, application/vnd.ms-publisher.

A MIME type is a string that tells browsers and other tools how to handle a particular kind of file.

About .pub Files

PUB files are primarily used as Microsoft Publisher documents. They store page layouts, texts, images, and graphics for print-ready materials.

They use the MIME types application/vnd.ms-publisher and application/x-mspublisher. This indicates they are designed for desktop publishing tasks and are most often opened with Microsoft Publisher or similar layout applications.

In some cases, a PUB file may also contain PGP public key data. This use is indicated by the MIME types application/pgp and application/pgp-keys, and the file acts as a key block for encryption purposes.

Additionally, when labeled with application/octet-stream, it could be a generic binary file, sometimes related to older versions like the ClickArt Personal Publisher document.


According to FilExt.com, this file extension can refer to different content types. Use the file with the correct software based on its MIME type.

Relationship between file extension and MIME type

A file extension is a suffix at the end of a filename that indicates what type of file it is. File extensions help both users and operating systems identify what application should be used to open the file.

File extensions are typically separated from the filename by a period (dot) and consist of 2-4 characters, though they can be longer. For example, in the filename "document.pdf", ".pdf" is the file extension.

File extensions are closely related to MIME types, as they both serve to identify the format of a file. However, while MIME types are used primarily by web browsers and servers, file extensions are used by operating systems and applications.

Associated MIME types

application/x-mspublisher, application/pgp, application/octet-stream, application/pgp-keys, application/vnd.ms-publisher

FAQs

What is a .pub file?

A .pub file is most commonly a document created by Microsoft Publisher, used for desktop publishing projects like brochures, flyers, and newsletters. Less frequently, the extension is used for PGP Public Keys, which store cryptographic keys for secure communication. The specific function depends on whether the MIME type is set to a Publisher type or something like application/pgp-keys.

How do I open a .pub file without Microsoft Publisher?

If you do not have Microsoft Publisher, you can open these files using LibreOffice Draw, which is a free, open-source alternative that can import Publisher documents. Alternatively, you can use online conversion tools to convert the .pub file to PDF or DOCX formats for viewing in other applications.

Can I open .pub files on a Mac?

Microsoft Publisher is not available for macOS, so you cannot open .pub files natively with Microsoft Office on a Mac. Mac users should try LibreOffice to view the layout or convert the file to a PDF using an online service before opening it in Preview or Adobe Acrobat.

How do I convert a .pub file to PDF?

If you have Microsoft Publisher installed, simply go to File > Export > Create PDF/XPS Document to save it as a PDF. If you do not have the software, many free online converters allow you to upload the .pub file and download a PDF version, ensuring the layout remains readable across different devices.

Why does my .pub file look like random text?

If opening the file reveals a block of text starting with headers like -----BEGIN PGP PUBLIC KEY BLOCK-----, it is actually a PGP Public Key file, not a layout document. These files are used for encryption and are associated with the MIME type application/pgp or application/pgp-keys. You should import this file into encryption software like GnuPG rather than a document editor.

What is the correct MIME type for Microsoft Publisher files?

The standard MIME type for Publisher documents is application/vnd.ms-publisher. Older systems or configurations might also use application/x-mspublisher. For a comprehensive list of related types, you can check mime-type.com.

Does Google Docs support .pub files?

No, Google Docs and Google Drive do not natively support viewing or editing .pub files. To view the content in Google Drive, you must first convert the file to a supported format, such as PDF, JPG, or DOCX.

General FAQ

What is a MIME type?

A MIME (Multipurpose Internet Mail Extensions) type is a standard that indicates the nature and format of a document, file, or assortment of bytes. MIME types are defined and standardized in IETF's RFC 6838.

MIME types are important because they help browsers and servers understand how to process a file. When a browser receives a file from a server, it uses the MIME type to determine how to display or handle the content, whether it's an image to display, a PDF to open in a viewer, or a video to play.

MIME types consist of a type and a subtype, separated by a slash (e.g., text/html, image/jpeg, application/pdf). Some MIME types also include optional parameters.

How do I find the MIME type for a file?

You can check the file extension or use a file identification tool such as file --mime-type on the command line. Many programming languages also provide libraries to detect MIME types.

Why can one extension have multiple MIME types?

Different programs and historical usage may assign various MIME identifiers to the same file format. Listing them together helps maintain compatibility across tools.