I've tried looking around for the discord invite but all the ones I've found seem to be outdated, so it'd be much appreciated if you could drop me a link. I think I used the mid 2011 build of roblox to open the game, but I'd love to try those experimental builds to see if it makes a difference. I originally downloaded the .rbxl file in 2020/current studio, so would that mean the mapfile is from current day? Or does it go off of the last time the game was updated (June 7th 2013)? I used wayback and the earliest version of the webpage I can find is 2015. http://web.archive.org/web/20151229202200/https://www.roblox.com/games/28603691/Naval-warfare
I forgot the original links, so here's a drive link instead. https://drive.google.com/drive/folders/1wESPAuLUmXhwBvw5dE_myQ9xrbTLrBPF?usp=sha...
The map might have already been converted, but that depends if you got an empty document error or not.
The year you download the file doesn't affect it's functionality, but when it was updated, does. No idea if this is true or not, but I'm just gonna assume its because ROBLOX keeps the old saved file up.
Kinda weird the earliest snapshot is 2015, though. Must just be really old and unpopular is all.