Bah nevermind, turned out I had a space in the command so osmfilter H:\france\france-latest.osm --keep=“natural= coastline” --drop-version -o=H:\france\coastline-test.osm was obviously grabbing every natural *
Bah nevermind, turned out I had a space in the command so osmfilter H:\france\france-latest.osm --keep=“natural= coastline” --drop-version -o=H:\france\coastline-test.osm was obviously grabbing every natural *