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frequency_coop_fix

This is to fix the crash on Frequency_coop map:

https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=784586558

The NAV file packaged with the map on Workshop causes server crashes. This VPK contains a modified NAV file. Add this to your subscribed_file_ids and it should overide the original NAV. If it does not, extract the frequency_coop.nav file from the VPK and drop it in the "Maps" folder on your server.