Click Install Extension. Choose your RBZ file from the open dialog. Select SketchUp → Preferences → "Extensions". Click Install Extension. Choose your RBZ file. Since RBZ files are Zip-compressed ...
Click Install Extension. Choose your RBZ file from the open dialog. Select SketchUp → Preferences → “Extensions”. Click Install Extension. Choose your RBZ file. Since RBZ files are Zip-compressed packages, extract them with standard ZIP utilities by renaming extension from .rbz to .zip.
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An rbz file extension is for Rail Baron Player game files. Open with Load Game option in Rail Baron Player. Probably cannot convert to anything else.
RBZ is a savegame format for Rail Baron computer game. RBZ files store player data and game progress. Files can be stored locally or in the cloud. Rail Baron is a board game where players are railroad managers.
SketchUp 8 first allowed compressed RBZ files. Search and download plugins from “Extension Warehouse”. Install RBZ plugins in Windows SketchUp by these steps.