An MBWB file contains a backup of a Minecraft-inspired game called Mine Blocks. It has players’ world data and settings. Mine Blocks runs on PCs and websites. Both versions use MBWB to backup worlds. In Mine Blocks, players explore random worlds. These have terrain, resources, and creatures. The MBWB format comes from the game’s developer, Zanzlanz. It lets players restore saved worlds. Windows doesn’t open MBWB files by default. It means Windows has no associated app. But other programs can edit, convert or print MBWB files. We explain what MBWB is and list some programs it works with. This helps users open these files more easily.