core_mapstyles.xml contains all the zonerect values for every map not supplied by SOE. You can reset your fog by changing just 1 didget of one cord for each, then visiting that zone befor running the updater again.
Running the updater will restore the standard cords, which will again reset the fog for any zone you visited with your tweaked settings. So you probably don't want to explore much before updating, just visit the zone(s) you want reset, log out, update, then explore.
Note: this does not clear your descoveries, mearly resets the fog layer.
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