Below is a Python example using the zklib library concept, which is the standard way developers interact with these files.
ZKTeco .dat files are often compressed or encrypted specifically for the device's internal memory management. The most reliable developer method is not to read the .dat file directly, but to connect to the device via the SDK and pull the data, which converts it automatically. zkteco dat file reader
Specify the folder path on your PC where the .DAT file is saved. Below is a Python example using the zklib