All about 3DX Files

The 3DX file type is primarily associated with Rhino 3D.

3DXFile Extension 3DX
File extension: 3DX
File type:  3D Model File

What is a 3DX file?

3DX files mostly belong to Rhino 3D by Robert McNeel & Associates. Files with 3DX extension contain 3-dimensional models usually created with Rhino 3D software developed by Robert McNeel & Associates. Objects that usually make up a 3DX file include geometric forms, models, control points, and surface areas built with lines and curves that make up complex, interactive, and organic 3D shapes. The 3DX file extension is an alternate extension of 3DM so a file ending in 3DX can be directly renamed to 3DM, and Rhino 3D will open and modify it without issue. Both 3DX and 3DM file formats are based on the NURBS mathematical model which leverages the openNURBS initiative to allow fast and accurate exchange of 3DX files and other 3-dimensional graphics across platforms. Windows and Mac platforms commonly access 3DX files through Rhino 3D. Linux and other platforms rely on several NURBS-based toolkits to transfer and view/modify 3DX files.

How to open 3DX files

You need a suitable software like Rhino 3D to open a 3DX file. You need a suitable software like Rhino 3D from Robert McNeel & Associates to open a 3DX file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your 3DX file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a 3DX file directly in the browser:. Just drag the file onto this browser window and drop it.

Online 3DX Text Viewer

Choose your .3dx file to analyze

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.3DX File Won't Open? Here is What You Can Do

Because .3DX files originate from various programs, they aren't universally openable.

  1. Identify the Source: Files received from architects or engineers often suggest a CAD 3D Model File workflow.
  2. Check the Header: Inspect the first bytes in a text or hex editor:
    • "PK" indicates a ZIP archive, often used for packaged 3D assets.
    • Readable XML suggests a text-based model format.
    • Unreadable binary data usually means a proprietary CAD format.
  3. Use the Original Software: You typically need the original program, such as Rhino 3D (by Robert McNeel & Associates) or Dassault 3DEXPERIENCE; if unsure, ask the sender.
  4. Use this Webpage: Drag and drop your .3DX file here to detect its format, extract readable text or metadata, and preview contents when possible.

Technical Data for 3DX File Extension


The following listing is compiled from the database produced by the 'Associate This!' program, selected data from the main FILExt database and file extension information submitted by users.

ProgramID: Rhino 3d model
EXEFile: %ProgramFiles%\RHINOC~1.0EV\System\Rhino3.exe %1

ProgramID: Rhino 3d model
EXEFile: %ProgramFiles%\RHINOC~1.0\System\Rhino3.exe


a 3dx 3D Model File is a special file format by Robert McNeel & Associates and should only be edited and saved with the appropriate software.

How to solve problems with 3DX files

  • Associate the 3DX file extension with the correct application.
  • Update your software that should actually open 3d model files. Because only the current version supports the latest 3DX file format. Search, therefore, e.g. on the Robert McNeel & Associates manufacturer website after an available Rhino 3D update.
  • To make sure that your 3DX file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
  • Click here to open your .3DX file online - secure, fast, and no downloads needed.
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