The ldk file extension is related to the LD System 824 firmware authorization data format.
LDK file extension - LD System 824 firmware authorization data
What is ldk file? How to open ldk files?
File type specification:
The ldk file extension is associated with the LD System 824 (Larson Davis System), a sound level meter and real-time analyzer device developed by PCB Group, Inc.
The ldk file stores some kind of firmware data for LD System 824.
This ldk 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.