Easy way to get the new file instead of copying and pasting is to redirect the output of the program to the .mtx file.New in the public folder is a Bmt to XML converter.... http://www.mediafire.com/download/3h9cv6ej2crzikh/bmt2xml-master-2b3c655_FIXED.zip
Crowtrobot was kind enough to correct a couple of errors that were generated by the tool, due to format changes from when the old tool was created.
The converter requires linux or a linux terminal.
usage...
./bmt2xml Material_Name.BMT
A text dump to terminal occurs and you can paste that into a new MTX file and your done.
Usage would be:
./bmt2xml Material_Name.BMT >> Material_Name.MTX
Just a little bit of a time saver