www.kwxport.org

You probably want the newest version!
Version 1.4.2 of kW X-port is done, and adds install options for French, German, Japanese and Simplified Chinese localized versions of 3ds Max. While I haven't translated the plug-in itself, at least this will let you install on a system using a version of 3ds Max that's not English.
Also, the "wrong tangent basis exported" bug has been fixed, as well as the "wrong Windows Installer version found" installation problem. Hopefully this will be a lot smoother for everybody!

You'll need to register and log in to download the installer! That way, I can send out updates if an important update is made to the installer or exporter.
kW X-port is written to support the needs of those developing 3D games using 3ds Max and the .X file format. The most common example of .X file format usage comes from the Microsoft XNA Game Studio tool set, although the Microsoft DirectX SDK also contains code to read and use .X mesh files. kW X-port supports almost every feature that is supported in general .X file importers, except for rarely used features such as progressive meshes.
kW X-port has been developed and tested to the point that it is now a very robust exporter for animated and static geometry, using Skin or Physique modifiers, Biped or Bones skeletons, or rigid (hierarchical) animated models. Where most other exporters will fall down in one way or another, especially when it comes to skinning, kW X-port generally will do the right thing.
Features of the exporter include:

• The ability to copy textures into the output folder of the export.
• Cutting the 3ds Max timeline into multiple separate animation clips.
• Including or excluding specific geometry based on flags.
• Exporting DirectX Shader Material parameters.
• Multiple texture coordinate sets (up to 4) in a single .X file.
• MaxScript support in the KWFunctions interface.
• And a number of settings and options that can tune the export to suit almost any export scenario.

Version 1.4.2, 2009-10-03

• Fix wrong tangent basis exported.
• Fix installation on localized versions of 3ds Max.
• Fix Windows Installer version problem.
• Add option to install plug-ins only (does not require Max to be installed).

Version 1.4.1, 2009-07-23

• Fix the "bad parameter values in default shaders" bug.
• Fix an installer package problem seen by some users.

Version 1.4.0, 2009-07-19

• Export multiple texture maps as shader from standard Max material.
• Support for 3ds Max 2010.
• Work-around for the bug where Effects/Shaders sometimes were not recognized by IGame.
• MaxScript API. Check out the KWFunctions interface, and the kwutils.ms sample script file.
• Documentation / Manual is now properly installed into Start menu program list.
• GUI improvements.
• Bug fixes.