.GDM File Extension

General Digital Music Module

Developer Edward Schlunder
1.0  |  1 Vote

What is a GDM file?

A GDM file is an audio module created for use with the Bells, Whistles, and Sound Boards digital sound library. It contains data that Bells, Whistles, and Sound Boards uses to play a song. GDM files are often found in video games created by MegaZeux.

More Information

Screenshot of a .gdm file in MilkyTracker
GDM file open in MilkyTracker

Bells, Whistles, and Sound Boards (BWSB) was a DOS-based sound library that video game developers and demoscene enthusiasts used to create and play music in the 1990s. Notably, BWSB was included in MegaZeux, a game creation system that was also available for MS-DOS.

Music created to be played by BWSB was saved as GDM files. These files describe the notes a song contains, how those notes are arranged, and the instruments used to play those notes.

How to open a GDM file

You can open a GDM file with MilkyTracker (multiplatform), Extended Module Player (XMP) (Linux), or Vitamin/CAIG ZXTune (multiplatform). MilkyTracker will automatically convert your GDM file to the .XM format. It will also allow you to edit the song your GDM file contains.

How to convert a GDM file

You can use MilkyTracker to convert a GDM file to the following formats:

  • .XM - Fasttracker 2 Extended Module
  • .MOD - Music Module
  • .WAV - WAVE Audio

For complete instructions on how to do so, refer to MilkyTracker's documentation.

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Programs that open GDM files

Verified by FileInfo.com

The FileInfo.com team has independently researched the General Digital Music Module file format and Mac, Windows, Linux, and Android apps listed on this page. Our goal is 100% accuracy and we only publish information about file types that we have verified.

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