You might want to make the model in Blender 2.6 then save the .blend file (making sure to triangulate it and save in legacy mesh format) then open it in Blender 2.49a then UV and animate.
blender 2.6 does not save animation/UV in a way compatable with ealrier versions of blender and does not have the capabilty of exporting .dts files as of yet.