/usr/share/plasma/services/modifierkeystate.operations is in plasma-workspace 4:5.5.5.2-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | <?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE kcfg SYSTEM
    "http://www.kde.org/standards/kcfg/1.0/kcfg.xsd">
<kcfg>
  <group name="Lock">
    <entry name="Lock" type="bool">
      <label>Whether to lock the key or not.</label>
    </entry>
  </group>
  <group name="Latch">
    <entry name="Latch" type="bool">
      <label>Whether to latch the key or not.</label>
    </entry>
  </group>
</kcfg>
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