UC gundam online, it uses modified .x files in 64bit floats. I have to modify the data manually after generation but I have already gotten it to work once... kinda.
Here is a 32bit float file "sphere" modified in the client
Doesn't look so good and the terrain kinda molded in with it. I tried instead trying a 64bit file with the 0303 major and minor but they didnt show up in the client, they did crash it afterwards after removing the transformations so I know it works "it also generates an error report about the mesh name so I know it works" Plain and simple the minor needs to be 02 and that simply cannot be hand written.