Microvellum Community

.mprx vs .mpr loading into WoodWOP

Anyone have experience with the .mprx format?  We updated the tool file extension in the settings to .mprx, which changes the file, but produces an error when trying to load directly into WoodWOP.  Just curious if anyone else has had this issue and figured out why the .mpr loads fine, but the .mprx does not.