How do I/can I restore a minecraft map with only the region data?

I found an old email from 2011 with .mcr files in it. I'd like to know what are on them. Thanks.
Best Answer
You should be able to. First, it'll be handy to know the coordinates of the regions that you have files for. Go to https://dinnerbone.com/minecraft/tools/coordinates/ and enter the file name into the "Region Information" section. It will tell you the position of the 1st and last blocks in that region.
Next, create a new world in Single Player. Once it's started, exit the game and open your Minecraft folder. Go into "saves" > "WORLD_YOU_JUST_CREATED" > "region" and paste in your region files. Start the world again and travel to those coordinates you found before.
If single player doesn't work, you might need to make a server and try it. If that doesn't work, then I'm currently out of ideas :/ Best of luck <3
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How do I view a Minecraft region file?
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Minecraft has had a common issue for years, however, where worlds will sometimes vanish on their own due to a particular file becoming corrupted. If this happens to you, where you log in one day and your world is gone, it doesn't mean the world has actually been deleted. You just can't access it at the moment.Why did all my Minecraft worlds disappear?
Storage locationEach world is saved in its own separate folder in the . minecraft/saves folder. Files relating to chunks in the Overworld are stored in the base world save folder, Nether files are stored in the DIM-1 subfolder, and End files are stored in DIM1 .Minecraft - How to FIX MISSING SAVE OR CORRUPT WORLD - Minecraft Tutorial
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