If memory serves me, that's the extension used on Allen Bradley RS Logix PLC program files. If not theirs, someone elses.
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Sorry, it is a file extension used in Siemens Step 7 for their Ladder files (derrr, you would think I would know that...).
Program files can be stored as Statement Lists (STL) Function Block Diagrams (FBD) or Ladder (LAD).
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