AD4 file extension - 4D Systems audio
What is ad4 file? How to open ad4 files?
File type specification:
The ad4 file extension is related to a proprietary audio format used by 4D Systems in their solutions.
Probably not used outside 4D Systems programs. Might also be no longer used.
This ad4 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.