Hello. A French friend of mine has recovered a copy of a build of Minecraft IE from the disappeared Cobalt Team. I am in the process of attempting to make Minecraft IE playable. In the source code, there are web services that Cobalt used that could be re-purposed and made functional again. You might wonder, isn't it already playable? Unfortunately, it's 3.0, the latest is 3.1 and thus is preventing the game from getting pass the "please update" screen.
Here's a snippet. If anyone else is interested, you could follow along as I post updates.
UPDATE (August 5th, 2019)
This process is taking too long than I anticipated. If you wish to take a look at MC: IE 3, then here's the download link.
Special thanks to my French friend, UniBrine, for providing the download. I hope this community gets revived.
You will need to find a way past the update screen to play it. The game is in French (might be able to change it, not entirely sure). You will need to use the OLD Minecraft launcher to get this to work.