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What is an RBXL file?
An RBXL file contains a location that defines a 3D world in Roblox, an online multiplayer building game. It stores information that describes the playing field, which consists of 3D models (.RBXM files), parts, tools, scripts, and teams. RBXL files can be created and opened with Roblox Studio.
In Roblox Studio, you can choose from a variety of models, meshes, decals, and audio to apply to vehicles, weapons, buildings, and NPCs that can be played in the Roblox game. All of this information is stored in the RBXL file.
You can create an RBXL file in Roblox Studio by selecting FILE → New. After you make edits to the file, you can save it by selecting FILE → Save or Save As....
How to open an RBXL file
You can open RBXL files with Roblox Studio by selecting FILE → Open....