Could you provide on what this file is for (e.g., a specific game mod, a government form, or a programming library)?
: Double-check if the extension is actually .tnk . If it's a CAD-related file, you might be looking for Tinkercad or Autodesk resources.
: Once you find the correct link, you can usually download it by clicking "Save" and then using "Extract All" or "Unzip" on your computer.