.SD File

The sd file extension seems to be mainly related to various audio formats, including the Entropic sound data format.

Entropic Research Laboratories used a proprietary file format for its WAVES+ display program, ESPS signal processing library and the HTK hidden Markov model speech recognition toolkit. WAVES+ and ESPS were withdrawn when Entropic was acquired by Microsoft in October 1999.

This sd file type entry was marked as obsolete and no longer supported file format.

This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.

Files with sd file extension can be often encountered as audio files saved in the Entropic sound data format.

How to open:

Use Awave Studio to playback or edit .sd files.

How to convert:

Various audio formats can be usually converted between one another.