What Is an X_T File?

How to Open, Edit, & Convert X_T Files

Screenshot of several X_T files in Windows 10 that open with Kubotek KeyCreator
X_T Files.

A file with the X_T file extension is a Parasolid Model Part file. They're also known as Modeller Transmit files.

Different CAD programs can export to, and import from, the X_T format. The files are text-based and composed essentially of numbers, which some CAD programs can read to identify the 3D model's geometry, color, and other details.

Parasolid Model Part files that are stored in binary are saved with the .X_B file extension. Older versions of the X_T format were XMT_TXT and XMP_TXT.

Note: Even though their file extensions look similar, X_T files have nothing to do with Mozilla Firefox Component files that use the .XPT extension.

How to Open an X_T File

X_T files can be opened with Siemens PLM Software called Parasolid and many other CAD programs, like Autodesk Fusion 360, VectorWorks, SolidView's Parasolid Viewer, Kubotek's KeyCreator, Actify, and 3D-Tool.

You can also open an X_T file with Notepad in Windows or any other free text editor, but these programs are only useful if you need to see the header data of the X_T file. This information includes the date the file was created, the OS used, and some information about the model.

Tip: Since the X_T file extension is a little different than most extensions (because of the underscore), I imagine it might be used in other programs that have nothing to do with 3D shapes. If your X_T file doesn't open with any of the CAD programs mentioned above, open it with a text editor from the link above, to see if there's any descriptive information within the file itself that can point you in the direction of a compatible viewer for your specific X_T file.

If you find that an application on your PC does try to open the X_T file but it's the wrong application or if you would rather have another installed program open X_T files, see ourĀ How to Change the Default Program for a Specific File Extension guide for making that change in Windows.

How to Convert an X_T File

Any X_T file should be able to be converted to another similar format using one of the X_T viewers listed above. In most programs, this is via a File > Save as option, or sometimes one labeled as Export.

Another option is to use the "evaluation" version of CAD Exchanger to convert an X_T file to a number of different formats, like STEP/STP, IGES/IGS, STL, SAT, BREP, XML, JT, OBJ, X_B, XMT_TXT, XMT_BIN, WRL, or X3D.

Autodesk Inventor should be able to convert your X_T file to DWG through the Environment > AEC Exchange > Save as DWG Solids menu option. You can then open your converted X_T file programs that support the DWG format, like Autodesk's AutoCAD, Design Review, and DWG TrueView programs.

More Help With X_T Files

See Get More Help for information about contacting me on social networks or via email, posting on tech support forums, and more. Let me know what kinds of problems you're having with opening or using the X_T file, including what programs you've tried up to this point, and I'll see what I can do to help.