Files with asmdat file extension can be found as archives from Extech Light Meter devices.
ASMDAT file extension - Extech Light Meter archive
What is asmdat file? How to open asmdat files?
File type specification:
The asmdat file extension is mainly related to the Extech Light Meter devices and used for its default archive format.
Probably contains saved recorded data for further use.
Most likely some old format without support. No further information could be found.
This asmdat 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.