How to Open XMT_TXT Files in Your 3D CAD Software Easily

Friday, August 21, 2026

Have you ever received an .xmt_txt file from a colleague or client, only to find that Windows refuses to open it? If your system is blocking or failing to recognize these Parasolid files, you are certainly not alone. This issue is surprisingly common in design workflows, but resolving it is quick and straightforward.

In this guide, we will break down what an XMT_TXT file is and walk you through the simple steps to open it effortlessly in your 3D CAD software.

What is an XMT_TXT File?

An XMT_TXT file is a text-based CAD file generated by the Parasolid geometry modeling kernel, which powers many popular industrial design applications. Parasolid files typically carry standard extensions like .x_t (text format) or .x_b (binary format).

Sometimes, during export or file transfer, the extension gets altered to .xmt_txt. Because Windows does not immediately associate this specific extension with standard CAD viewers, it often blocks the file or fails to launch the appropriate application.

Why Windows Blocks Your Parasolid File

There are two main reasons Windows might prevent you from accessing an XMT_TXT file: 1. Unrecognized Extension: Your operating system does not automatically link .xmt_txt with installed software. 2. Security Blocks: Windows Security frequently restricts files downloaded from the internet or received via email attachments for safety.

Step-by-Step: How to Open XMT_TXT Files

Follow these simple troubleshooting steps to get your design files working again:

1. Unblock the File: Right-click the .xmt_txt file, select Properties, and check the Unblock box near the bottom of the General tab if present. Click Apply and then OK.
2. Rename the File Extension: The easiest workaround is changing the file extension manually. Right-click the file, choose Rename, and change the ending from .xmt_txt to .x_t. Windows will show a warning about changing extensions—click Yes to confirm.
3. Import into Your Software: Launch your preferred 3D CAD program (such as SolidWorks, Siemens NX, or Autodesk Inventor) and use the File > Open or Import option to open the newly renamed .x_t file.
4. Use a Dedicated Viewer: If you do not have a full modeling suite installed, you can use free tools like eDrawings Viewer or Parasolid-compatible web viewers to inspect the geometry.

Final Thoughts

Dealing with unexpected file formats can slow down project timelines, but opening Parasolid files does not have to be confusing. By simply adjusting file extensions and updating security settings, you can seamlessly import and manage any 3D CAD model without hassle.

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