Files with dt file extension could be found in old Macintosh computers as part of its operating system. These files are part of the file system.

There is one other file type using
the DT file extension!

empty icon.dt - PowerBASIC data

Detailed description

Software that open dt file

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DT file extension - Macintosh file data fork

What is dt file? How to open dt files?

File type specification:

System file type icon System file type

dt file icon: dt filetype icon

The dt file extension is used for data files in older Macintosh operating system versions.

In computer file systems, a fork is additional data associated with a file system object. A file system might support only one fork per file or might support multiple named forks. Unlike extended attributes, which are typically limited in size, a fork can be of arbitrary size, possibly even larger than the file's data.

The default software associated to open dt file:

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:

As far as we know, these files were part of the original Macintosh OS, you cannot access them manually.

How to convert:

A conversion of this particular *.dt file type seems to be very unlikely.

List of recommended software applications associated to the .dt 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 dt file, edit dt file, convert dt file, view dt file, play dt file etc. (if exist software for corresponding action in's database).

Unspecified and all other actions for computer programs working with dt file - Macintosh file data fork

Click on the software link for more information about Mac OS X. Mac OS X uses dt 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:

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