An ad file extension is related to the AppleDouble and used for its encoded files.

There are 5 other file types using
the AD file extension!

empty - After Dark screen saver data

empty - AxSys script file

empty - UNIX application default resource file

ad - Application Diagram data

empty - Anno Designer project

AD file extension - AppleDouble encoded data

What is ad file? How to open ad files?

File type specification:

Encoded and encrypted file type icon Encoded and encrypted file type

ad file icon: ad filetype icon

The ad file extension is related to the AppleDouble and used for its encoded files.

AppleDouble leaves the data fork in its original format, allowing it to be edited by normal Unix utilities. The resource fork and Finder information, both propietary and lacking editors under Unix, were combined into a second file.

AppleDouble format should be the primary format when sending a Macintosh document. It makes it possible for a user that can't decode the AppleDouble header to read and use the Data fork of the document.

It also keep the Macintosh specific information in the AppleDouble header, so a user who can decode the AppleDouble header can get the extra information, such as customised icons, which is not essential to the document itself.

Mime types:

This ad file type entry was marked as obsolete and no longer supported file format.

This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.

Updated: May 6, 2024

The default software associated to open ad file:

macOS icon

Apple, Inc. logomacOS  Apple macOS / Mac OS X software

Company or developer:
Apple, Inc.

macOS is Unix-based desktop operating system, a successor of Mac OS X system for MacBook-family, iMac, Mac Mini and Mac Pro computers, developed and sold by Apple, Inc.

Mac OS X icon

Apple, Inc. logoMac OS X  Apple macOS / Mac OS X software

Company or developer:
Apple, Inc.

OS X or Mac OS X is Unix-based operating system developed by Apple Inc. for Macintosh computers. It contains basic core applications for everyday use, such as Finder basic file manager, Safari for Internet browsing, QuickTime for video, iTunes for managing audio data and iPod, iOS devices management , iMessage instant messaging, Mail, Contacts, Calendar and many more.

The latest version 10.11 of OS X is called El Capitan. It is available to purchase on Mac App Store as well as is distributed with new Mac computers and notebooks. It includes features to improve the security, performance, design and usability.

OS X operating system was replaced by new macOS in 2016!

Help how to open:

Use compatible tools to work with *.ad files.

How to convert:

Probably can be exported to other formats.

Related links:

AppleDouble full overview

List of recommended software applications associated to the .ad file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open ad file, edit ad file, convert ad file, view ad file, play ad file etc. (if exist software for corresponding action in's database).

Unspecified and all other actions for computer programs working with ad file - AppleDouble encoded data

Click on the software link for more information about macOS. macOS uses ad file type for its internal purposes and/or also by different way than common edit or open file actions (eg. to install/execute/support an application itself, to store application or user data, configure program etc.).

Apple macOS / Mac OS X:

Main software associated with ad file by default:
macOS small icon macOS
Mac OS X small icon Mac OS X

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