The developers of Minecraft are gone. A new mod (VM Computers) for Minecraft allows players to build a computer that actually runs Windows 95 and other operating systems.
The mod uses VirtualBox, a free open source virtual machine software to run operating systems such as Windows 95.
So in Minecraft you can create virtual hard drives to install operating systems from ISO files.
Of course, the Minecraft community started experimenting with the VM Computers mod and someone managed to do Doom to Run in Minecraft | Of course with the new feature we will see a lot more. You could, for example, play Minecraft on a computer within Minecraft.
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