QDT File Extension

QuarkXpress Auxiliary Dictionary Format

File Type qdt
Developer Quark, Inc.
Popularity
4.3 (36 votes)
Application Windows Notepad
Category Text Files
Format Binary

What is a QDT file?

The QDT extension is related to QuarkXpress Auxiliary Dictionary Format and is classified in the Text Files category, which contains 315 files.

Quark, the developer of the QuarkXpress Auxiliary Dictionary Format (QDT), has released file format and 2 programs designed to handle them.

QDT file support extends to various operating systems, including Linux, Windows and Mac OS. There are 6 programs available to open a QDT file, including popular tools like Gedit, Windows Notepad and Nvu.

Windows

Mac OS

Linux

How to open a QDT file?

If you are having trouble opening a QDT file, it usually means the right software is not installed. Choose a program from the list that matches your operating system. Next, visit the official website of the developer, download the software, and install it on your device.

Thanks to their popularity, Gedit, Windows Notepad and Nvu are often the go-to programs for managing QDT files. If you want the most recent release of Windows Notepad, head over to the Microsoft site and download the version designed to run on all platforms.

After completing the installation, QDT files should be recognized by the system and linked to Windows Notepad.

Set Windows Notepad as your default QDT viewer

Set default app to open files on Mac

Right-click or Control + left-click on the desired QDT file to open a menu of available actions;
Choose "Open in Application" and click "Other";
In the lower section of the window, you’ll find the "Enable" menu, with "Recommended Programs" pre-selected as the default option;
Select "All Programs" in this menu, and then search for Windows Notepad. Check the box next to "Always open in app" to make sure it’s the default option.

Change a default app in Windows

To get started, right-click your QDT file, then choose "Open With" and select "Choose Another Application" from the context menu;
From the list of applications in the pop-up window, find and select Windows Notepad as your desired application;
Check the "Always use this app" checkbox, and then click "OK" to set your chosen app as the default for opening QDT files.

Solving Common QDT File Challenges

While QDT files can sometimes present difficulties, most problems can be resolved quickly with minor software modifications. Check the tips below to help solve them.

What Causes Windows Notepad to Crash Frequently?

Insufficient software updates are a likely cause of Windows Notepad crashes. Be sure to install the latest updates for Microsoft products.

A simple restart of your computer can often fix many common problems, which is why it is the recommended first step before making any adjustments to your software settings.

How can I restore a damaged QDT file?

Start a data recovery program and open the damaged QDT file. Then, choose the "Repair" option from the menu. Allow the recovery process to complete, which will automatically repair the damaged text files.

How can I determine if my QDT file is damaged?

Characteristics of corrupted QDT text files can include:

Windows Notepad or other programs stop responding or crash when trying to handle the file;
Error notifications appear during file manipulation;
When opening the file, errors occur or the inability to access its contents;
Unexplained QDT file size inflation;
Editing the archive in Nvu is hampered by poor overall performance;

How to edit a QDT file?

To modify QDT files, you need to install special software that makes it possible to open and edit text files. Online QDT editors are more restricted compared to software designed for QuarkXpress Auxiliary Dictionary Format.

Best QDT Editor Software in 2026

Taking the above factors into account, we have selected a list of QDT editors currently available.

QDT Editor Software	Developer	Platforms	Overall Rating
TextEdit	Apple	Mac OS	4.8 out of 5 (40 reviews)
Gedit	GNOME	Linux	4.6 out of 5 (38 reviews)
Notepad++	Notepad++ Team	Windows	4.6 out of 5 (37 reviews)
Nvu	Linspire. (Xandros)	Windows, Mac OS, Linux	4.5 out of 5 (36 reviews)
Windows Notepad	Microsoft	Windows	4.2 out of 5 (37 reviews)

Convert files to and from QDT

If working with a QDT file is challenging, one solution is to convert it to formats like QIF or other supported formats.

After converting a QDT file, some capabilities may be limited, but you can often convert it back to the original format.