kW X-port version 1.4.4 adds the MaxScript interface back. It somehow got lost in a previous version. kW X-port is the premier .X file exporter for 3ds Max versions 9, 2008, 2009 and 2010, and comes in 32-bit and 64-bit versions. It stores exporter settings with the file, so that you don't need to re-set them each time you export. Now, you can also script the exporter, leading to even more artist productivity! Download kW X-port for 3ds Max today! Oh, and did I mention? It's not only free (as in beer), but also free (as in speech -- it's MIT license!)

Good News! am still using .x format for a while, md5 is too much trouble to do skinning in the gpu.

thanks for sharing