.DDT File Extension

Michael Vinther
File Type:
Diagram Designer Template

Having trouble opening .ddt extension? Don't panic! This page explains what ddt files are as well as suggests programs you may use to open ddt files. You can download these programs through this page.

What is a DDT file?

Ddt file extension has Diagram Designer Template file type, developed by Michael Vinther, which is associated with the "data files" category.

Diagram Designer is a free diagram editor for creating flowcharts and UML diagrams. Template files created in this program are saved in files with this extension. They contain various objects for building diagrams, also text, and connecting lines. DDT files are used for saving technical documentation for business processes, object-oriented program code, and other drawing concepts.

To learn how you can open the given file, read the information below.

ddt file icon
Michael Vinther
File Type:
Diagram Designer Template
Data Files

How to open DDT file?

Double click the ddt file to open it. The file will open automatically if file associations have been correctly installed and there is a proper program on your computer; if not, file associations may be corrupted and your OS either cannot find the proper program, or you might not have one for opening the file. First, we recommend downloading our utility to fix file association errors; then, you can download any program for opening the .ddt extension from the ones suggested below. If you are certain there is nothing wrong with the file associations, you may proceed to method 2 right away; besides, if you can't make up your mind when choosing the right program, use Universal File Viewer from the last method.

Method 1: Fix file association errors

Follow these steps in order to automatically fix the ddt extension associations' problem in no time:

  • Step 1: Click on "Download Solution" to download automatic tool provided by WikiExt.
  • Step 2: Click "Start Scan" to identify all potential issues.
  • Step 3: Review scan results and click "Fix Items".

File Size: 3.04 MB, Download time: < 1 min. on DSL/ADSL/Cable

This Tool is Compatible With: Windows XP, Vista, 7, 8/8.1, 10

Method 2: Download the appropriate software

The given list provides programs which may be used for opening or converting the ddt file. Choose the proper program for your OS, and click it to start the download or proceed to the developer's website.

Programs that open DDT files

  • Windows Windows
    • Diagram Designer Diagram Designer

Method 3: Use universal file viewer

In addition to the list of programs above, we recommend using Universal File Viewer. This tool can open over 250 file extensions and, most likely, it will be able to open the ddt file as well. Download Universal File Viewer for your OS.

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