A hdev file extension is associated with the HDevelop and used for its data files.
HDEV file extension - HDevelop data
What is hdev file? How to open hdev files?
File type specification:
The hdev file extension is related to the HDevelop software. The hdev file contains some kind of data utilized by this program.
Most likely some old format without support. No further information could be found.
This hdev 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.