Minecraft .mcworld file not importing. (Says that it's importing and then closes.)

In the Minecraft version Windows 10, certain .mcworld files crash the Minecraft Windows 10 world importer. This world was exported to all of my main file folders and has crashed avery time upon the importing process. Maybe it's just my computer. If you can, I'll give you the .mcworld package and it would be nice if you could give me the world folder which I will import manually. I do believe this is a bug, as the .mcworld was only exported about one day ago. All of my other .mcworld folders import correctly. The "Importing screen" opens for about 36 milliseconds, then closes on its own. If needed, I will give you the .mcworld file to check out and again, possibly import for me and send me the file.