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.X_B·File Extension

X_B 3D Model — A .x_b file is a X_B 3D Model. It is a 3D model format used to store meshes, scenes and printing geometry.

3D Modelmodel/vnd.parasolid.transmit.binary

Quick facts

Extension.x_b

File typeX_B 3D Model

MIME typemodel/vnd.parasolid.transmit.binary

Category3D Model

Charset—

Compressible—

What is .x_b

What is a .x_b file?

A .x_b file is a X_B 3D Model. It is a 3D model format used to store meshes, scenes and printing geometry.

In the mime-db registry it maps to model/vnd.parasolid.transmit.binary. When serving .x_b over HTTP, set the Content-Type header as shown in Developer info below.

Related entities: it maps to model/vnd.parasolid.transmit.binary — and is delivered over HTTP via the Content-Type header.

How to open .x_b files

Use Blender or MeshLab to open and edit .x_b files.
Any text editor (Notepad, VS Code) can inspect the raw content as text.

Developer info

When served over HTTP, responses should set the following header:

Content-Type: model/vnd.parasolid.transmit.binary

Common software that reads/writes .x_b:

BlenderMeshLabAutodesk Viewer

Relation chain

.x_bextension of

format

X_B 3D Modelserved as

mime type

model/vnd.parasolid.transmit.binarysent via header

http header

Related extensions

Related MIME types

model/vnd.parasolid.transmit.binary

.x_b

Common uses

3D printing
Game assets
CAD and design exchange

How to edit .x_b files

Open the file with Blender, make your changes and save.
Most editors preserve the original formatting and encoding — avoid changing the charset.

How to create .x_b files

Create a new file and save it with the .x_b extension, or export this format from Blender.

Frequently asked questions

What programs can open .x_b files?

Common options include Blender, MeshLab, Autodesk Viewer. You can also open many of these files with built-in viewers or a browser.

How do I create a .x_b file?

Create a new file in any text editor or the app that owns the format and save it with the .x_b extension.

What is the relationship between .x_b and the model/vnd.parasolid.transmit.binary MIME type?

model/vnd.parasolid.transmit.binary is the media type identifier used for .x_b files during network transfer (for example in the HTTP Content-Type header).

Sources & standards

Updated 2026-09-13

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