Programs enabling conversion of the file:
If your objective is to convert the file from JT to the file 3DXML, you can use any of the applications listed. JT to 3DXML conversion process in every program intended for this purpose (so-called converters) is very intuitive and everyone is able to manage converting a file.
However, bear in mind that the list may also include programs to support and work with the indicated extensions JT and 3DXML - and not only converters. In such a case, you need to open the source file JT and from the options available in the program, choose ”Save as... 3DXML" or "Export to 3DXML".