Files with hdat file extension can be found as part of old vStaticIP program. Data file.
HDAT file extension - vStaticIP data
What is hdat file? How to open hdat files?
File type specification:
The hdat file extension was in the past used by a program called vStaticIP for one of its data file.
Seems like discontinued program and obsolete file type.
This hdat 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.