Options file in every MIZ package. Does the game read this file when loading a mission?

[Marklar]

Quick example. I have units set to Imperial in the game settings. Because when I fly MI-8 (or any other Russian plane) I prefer to have KM instead of NM. Instead of changing game settings back and forth I edited OPTIONS file in one of the missions with MI-8 and set units to metric. Unfortunately when I load this mission units are still set to Imperial instead of Metric. So, does the game read this OPTION file when loading a mission? If not, why this file is included in MIZ package?

[Habu_69]

DCS reads the .miz file once, an only once, at mission load time.