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

The .att file extension is associated with 2 MIME types:

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

About .att Files

ATT files are a type of file that can hold different kinds of data.
They are used either to store plain text data as Playmation Attributes or to hold binary data as a Calamus ASCII Translation Table.

Playmation Attributes (text/plain) – These files carry plain text that can be read and edited with simple text editors like Notepad. They usually store configuration details or attribute data needed by Playmation software.
Calamus ASCII Translation Table (application/octet-stream) – These files have a binary format. They hold a set of instructions or mappings for translating ASCII text. Specialized software, often the Calamus application itself, is required to view or modify these tables.

According to FilExt.com, the dual MIME types show that the .att extension handles two distinct uses depending on the application involved.

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

text/plain, application/octet-stream

FAQs

What is an .att file?

An .att file is typically associated with Playmation as a text-based attribute file or with Calamus as a binary ASCII translation table. However, users frequently encounter this extension as a generic email attachment artifact (e.g., ATT00001.att) caused by encoding issues between mail servers.

How do I open an .att file?

First, try opening the file with a simple text editor like Notepad (Windows) or TextEdit (macOS). If the content is readable text, it is likely a Playmation file or a mislabeled email body. If the file displays unreadable symbols, it is likely a binary Calamus file requiring specific software or a corrupted attachment.

Why did I receive an email attachment named ATT00001.att?

This usually happens when an email client fails to properly decode a message or attachment, defaulting to a generic filename. The file might contain the text of the email or a file that lost its original extension; try renaming it to the expected type (like .jpg or .pdf) or viewing it as plain text.

Can I convert .att files to other formats?

If the file is a Playmation Attribute file, you can simply rename it to .txt or save it as a text file using your editor. Binary Calamus files are specific to that software and generally cannot be converted to standard formats without the original application.

What are the MIME types associated with .att files?

The file uses text/plain for text-based content and application/octet-stream for binary data. You can learn more about how these types function on mime-type.com.

Are .att files safe to open?

Text-based .att files are generally safe, but you should exercise caution with binary files marked as application/octet-stream received via email. Always scan unknown attachments with antivirus software before opening them.

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.