D00 File

What are D00 files and how to open them

Are you having problems opening a D00 file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your D00 files.

What is a D00 file?

D00 files have multiple uses, and EdLib Module is one of them. Read more about the other uses further down the page.

EdLib Module

EdLib Module files store music modules created by the EdLib tracker for the AdLib sound card. The files are saved by EdLib's player routines (version 4.01 by JCH/Vibrants) and contain the data needed to play back AdLib-style FM synthesis music: instruments, special effects, note sequences, and channel arrangements. They are good for retro music playback, chiptune-style compositions, and soundtrack work where FM synthesis is desired.

These files are written by the EdLib tracker and are used by EdLib's player routines. They encode instrument definitions (carrier/modulator parameters, envelopes, fine-tuning), special effect tables (SpFX), pattern or sequence data for each of nine AdLib channels, arrangements defining when sequences play on which channels, and descriptive metadata (e.g. song text). During playback, the player reads these structures and drives the AdLib OPL2/OPL3 hardware (or emulation) to produce sound.

Files begin with a 6-byte signature sequence: ASCII "JCH&" followed by bytes 0x26 0x02 0x66 at file offset zero.

How to open D00 files

Important: Different programs may use files with the D00 file extension for different purposes, so unless you are sure which format your D00 file is, you may need to try a few different programs.

We have not yet verified any programs for Windows that work with this specific file format. If you know one, please use the 'Suggest a program' link below. Thanks!

Last updated: September 21, 2026

All known file formats using extension .D00

While EdLib Module is a popular type of D00-file, we know of 2 different uses of the .D00 file extension. Different software may use files with the same extension for different types of data.

Personal Pearl Data Base

Personal Pearl Data Base is a database and report-generation format created by PearlSoft for CP/M-86 and MS-DOS systems. It stores structured records in multiple related files so that users can define forms for data entering, relate several datasets through matching field names, and generate reports using defined layouts. It is designed so that changes in one dataset automatically propagate to related files when a shared field is updated.

PearlSoft writes this format when a database is created in Personal Pearl version 1.x. The database typically consists of several components: a definition of data entry forms, a definition of reports, data‐files holding records, and index files for fast lookup. Data is entered through custom forms and reports are produced either to screen, printer or exported to disk in ASCII form. Personal Pearl also allows identifying common fields among multiple files so that records stay consistent across related tables.

Files in this format begin with a byte signature at offset 0 that reads in ASCII as "…FCD" (bytes 0x00 01 03 46 43 44).

We have not yet verified any programs for Windows that work with this specific file format. If you know one, please use the 'Suggest a program' link below. Thanks!

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