Message created by Infacta GroupMail, a group email newsletter program; contains a saved email message; may include tables, images, rich text, and other HTML email message elements.

To create a GMD file, select "Messages," click "New," select File → Save As → A Document, choose a save location, name the file, and click Save.

A GMD file contains information about how text is displayed in Nintendo 3DS games. It stores information about dialogs that appear during the game, such as the actual text and the appearance of the dialog.

GMD files are typically packaged in .ARC Nintendo archive files and distributed with games. The files are not meant to be manually opened. Instead, the files are referenced during gameplay. However, some 3DS gamers enjoy modifying gameplay and editing GMD files. These users extract GMD files from ARC files using utilities like ARCTool and convert the files to editable text files.