What's Roblox's internal mesh file extension? (.obj / .fbx / ?)

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Roblox FileMesh Format Specification

( Latest Revision: 3/30/2025 ) When a mesh is uploaded to Roblox, it is converted into an in-house format called FileMesh, that the game engine can read and efficiently work with. Roblox’s FileMesh format isn’t a format you can normally export to or import into Roblox Studio, but you can download meshes by their assetId using the assetdelivery API. This resource aims to be an unofficial spec for interpreting this format, so you might be able to write code externally that can read FileMesh file…