A zdk file extension is related to the ZQuake, a video game for Palm OS and it is used for its game files.
ZDK file extension - ZQuake game data
What is zdk file? How to open zdk files?
File type specification:
The zdk file extension is associated with the ZQuake, a third party port of original Quake 3D action first person shooter computer game for devices with Palm OS operating system.
The zdk file stores various game data.
This zdk 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.