you can get MDX here

1) once you download it(preferably into your $mircdir) extract the .zip file into a sub directory using a program like winrar and [size=16]REMEMBER THE FILE PATH![/size]

2) if you load it, the MDX.mrc file has several aliases but only two that you need for this script so its best not to even load the file as this just complicates matters

3) once you've extracted the .zip file open your remotes and go to the and click on the alias's tab and add two aliases(without using the alias prefix) an ex could be:

mdxfile { return $+($mircdir,mdx\,$1,.mdx) }
mdx { var %dll = $mircdirMDX\mdx.dll | return $dll(%dll,$1,$2-) }

change the file path to the one that you saved MDX.dll into(the one from step 1)