SDX is an obsolete audio format. SDX files contain 38-bit mono audio samples. SDX files were popular during the early 1990s.

Modern applications no longer offer support for SDX files beside a few more specialized tools. One of such tools is Awave Studio,available for Windows (Vista,7, 10). It is a paid software available for 85 USD per user license. A shareware version is also available for download on developer’s website.