WinConvX

WinConvX is a nifty application designed for some of the DOS tools on your computer. The DirectX SDK comes with the following DOS tools that can be used to convert mesh files into .x files: Conv3ds.exe, Convx.exe, Convxof.exe.
It sports a really intuitive graphical interface with lots of features and tools that you can adjust.

Sleek graphical interface with plenty of tools at hand

The application doesn't take long to install and it doesn't have a complicated setup that you would need to complete before you can use it. However, this program requires the .NET Framework and the DOS tools available in the DirectX SDK.
It's graphical interface is quite intuitive, with all features at hand and plenty of settings that you can adjust.

Convert files

It allows you to convert 3D Studio Files (.3ds) into .x files and you can enable the feature that outputs models as single mesh without frame hierarchy. There's also the option to include animation data and wrap all hierarchies in a top level frame.
The extension of texture for map files can be changed and you can have it exclude material or normal data. You'll need to provide the application with the source file and destination folder before you can actually start converting.

More features and tools

For the convx.exe file, you can generate text in x-file format and include template definitions. The same features are available for convxof.exe files, but you will have to provide it with the path of the original file and the destination folder. When you're done, simply click on the convert button for changes to occur.
In conclusion, WinConvX is a very nice software solution for three DOS tools, you can use it to convert them into various formats and to adjust settings. It comes with the option of excluding data and information from the original file.