.DMD File Extension

SQL Developer Data Modeler File

Developer Oracle
3.6  |  10 Votes

What is a DMD file?

File created by Oracle SQL Developer Data Modeler, a program used for designing structured data models such as relational database schemas; stores the data structure and relationships and can be displayed visually in software.

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DMD files are used for storing the designed the data model as well as for assisting in the generation of the final database.

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Programs that open DMD files

dBASE Data Module

Developer dBASE
2.0  |  1 Vote

A DMD file may also be a data module created by dBASE, an IDE with database management capabilities. It is similar to a dBASE Form (.WFM file) but only stores data objects, including Database, Query, Session, and StoredProc objects. Data modules allow dBASE users to save objects in one container, which is helpful when re-using a set-up in a different context (e.g., re-using a set of tables from a report in a form).

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Screenshot of a .dmd file in dBASE 2019
DMD file open in dBASE 2019

dBASE is a Windows application with various features for managing databases and building and compiling programs. Some advantages of data modules include:

  • Not needing to duplicate data access components in different contexts (e.g., reports, forms, etc.).
  • Designing queries once instead of recreating them repeatedly.
  • Separating different types of code for organizational and maintenance purposes.

How to open a DMD file

You can open DMD files with dBASE in Windows. For example, you can open a DMD file by selecting File → Open.

Opening a DMD file with a text editor

DMD file open in Microsoft Notepad
DMD file open in Microsoft Notepad

Since DMD files contain plain text, you can also open the files with a text editor, such as Microsoft Notepad (Windows) or Apple TextEdit (Mac). You may need to rename the .dmd file extension to .txt for the text editor to recognize it.

When opened in a text editor, you can modify the source code in the data module. However, it will not appear the same as if you open the file with dBASE. Also, incorrectly editing the file will corrupt the data module.

Programs that open DMD files

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