THIS IS MY levelrotation.xml IT WORKS FINE BUT YES YOU SHOULD ALWAYS CHECK IT BY OPENING IT WITH EXPLORER AND EDIT IT WITH NOTE PAD.
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<levelrotation>
<level name="Multiplayer/ia/Zone_Gladiator" gameRules="InstantAction">
<setting setting="net_mapDownloadURL
http://mnuclan.com/crysis/maps/ia/Zone_Gladiator.zip"/>
</level>
<level name="multiplayer/ia/terminal" gamerules="InstantAction" />
<level name="Multiplayer/ia/waterworld" gameRules="InstantAction">
<setting setting="net_mapDownloadURL
http://mnuclan.com/crysis/maps/ia/waterworld.zip"/>
</level>
<level name="multiplayer/ia/excavation" gamerules="InstantAction" />
<level name="Multiplayer/ia/the_hangar" gameRules="InstantAction">
<setting setting="net_mapDownloadURL
http://mnuclan.com/crysis/maps/ia/the_hangar.zip"/>
</level>
<level name="multiplayer/ia/stranded" gamerules="InstantAction" />
<level name="Multiplayer/ia/Ghost_Stories" gameRules="InstantAction">
<setting setting="net_mapDownloadURL
http://mnuclan.com/crysis/maps/ia/Ghost_Stories.zip"/>
</level>
<level name="multiplayer/ia/graveyard" gamerules="InstantAction" />
<level name="Multiplayer/ia/arena" gameRules="InstantAction">
<setting setting="net_mapDownloadURL
http://mnuclan.com/crysis/maps/ia/arena.zip"/>
</level>
<level name="Multiplayer/ia/SmallCompound" gameRules="InstantAction">
<setting setting="net_mapDownloadURL
http://mnuclan.com/crysis/maps/ia/SmallCompound.zip"/>
</level>
<level name="multiplayer/ia/Savanna" gamerules="InstantAction" />
<level name="Multiplayer/ia/Bog" gameRules="InstantAction">
<setting setting="net_mapDownloadURL
http://mnuclan.com/crysis/maps/ia/Bog.zip"/>
</level>
<level name="multiplayer/ia/peak" gamerules="InstantAction" />
<level name="Multiplayer/ia/Shipment" gameRules="InstantAction">
<setting setting="net_mapDownloadURL
http://mnuclan.com/crysis/maps/ia/Shipment.zip"/>
</level>
<level name="multiplayer/ia/treehouse" gamerules="InstantAction" />
<level name="Multiplayer/ia/Junkyard" gameRules="InstantAction">
<setting setting="net_mapDownloadURL
http://mnuclan.com/crysis/maps/ia/Junkyard.zip"/>
</level>
<level name="multiplayer/ia/battleground" gamerules="InstantAction" />
<level name="multiplayer/ia/coast" gamerules="InstantAction" />
<level name="multiplayer/ia/outpost" gamerules="InstantAction" />
<level name="multiplayer/ia/quarry" gamerules="InstantAction" />
<level name="multiplayer/ia/steelmill" gamerules="InstantAction" />
<level name="multiplayer/ia/armada" gamerules="InstantAction" />
</levelrotation>
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