Is .rbxmx an official ROBLOX Studio file extension?

Although I usually prefer using TC with specific things, I’ve been sent some materials to work with from someone else.
The format is .rbxmx, but I would usually receive .rxbm files.

Is that extension legitimate?

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Yes, it is legitimate. https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwjP4pOpi7_tAhWD9Z4KHWD2AGkQFjAAegQIBBAC&url=https%3A%2F%2Ffileinfo.com%2Fextension%2Frbxmx&usg=AOvVaw0IIMaTDNCBs2HeKMR-ivbI

(sorry for the really long link)

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Yes, this is a legitimate file. This file is used for 3D Models.

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Yes. It’s a file extension for models. It stores Roblox models that you can import using this button: image.

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Both rbxms (model files) and rbxls (studio files) are legitimate and created by roblox for the purpose of roblox.