An adev file extension is related to the AppleTalk and used for its extension files.
ADEV file extension - AppleTalk extension
What is adev file? How to open adev files?
File type specification:
The adev file extension is used for the AppleTalk, a network protocol developed by Apple. The adev file stores extension.
Most likely some old format without support from developer. No further information could be found.
This adev 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.