Open RBLX File
An RBXL extension file contains the 'coordinates' or location that defines a place in ROBLOX, an online multiplayer construction game.
The RBXL file is similar to the RBXM file, from ROBLOX as well, which stores information that describes a 3D modeled playing field, parts, tools, scripts and equipment, while the RBXL files define the playing area, or world 3D, inside ROBLOX.
ROBLOX Studio
ROBLOX has its own scenario editor, called ROBLOX Studio, in ROBLOX Studio you can choose from a variety of models, meshes, decals and audio to be applied to the elements of the game, such as vehicles, weapons, buildings and NPCs that are they can play in the ROBLOX game. All this information is stored in the RBXL file.
To create an RBXL file you must have the software installed: