.ADX File Extension

2 file types use the .adx file extension.

Approach Index File

Developer N/A
4.1  |  14 Votes

What is an ADX file?

Stores the indexing information for a Lotus Approach relational database

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Programs that open ADX files

IBM Lotus Approach (part of Lotus SmartSuite)

ADX Audio

Developer CRI Middleware
3.3  |  7 Votes

An ADX file may also be an audio file used by a video game developed using CRIWARE-ADX. Typically, ADX files contain background music played in a game. For example, Sonic Mega Collection contains music saved as ADX files.

More Information

CRI Middleware developed the ADX format for use in its own and other developers' video games. Notably, several games in the Sonic the Hedgehog series use ADX audio files.

Primarily, ADX files contain background music that is meant to be looped during gameplay (e.g., while a player is playing a specific level). ADX files are compressed using a lossy Adaptive Differential Pulse-Code Modulation (ADPCM) variant.

NOTE: Some Sofdec videos (.SFD files) contain interleaved ADX audio.

How to open an ADX file

You can open an ADX file with vgmstream (multiplatform) to play the audio it contains. You can also play ADX files with Foobar2000 or Nullsoft Winamp, after installing those programs' vgmstream plug-ins.

How to convert an ADX file

With the vgmstream plug-in installed, you can use Foobar2000 to convert ADX files to .WAV (WAVE Audio) and other formats.

Programs that open ADX files

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