It's Entity Workshop 2.And that is not the problem with the model.Entity Workshop (as do the other entity makers,including the FPSC official one) do not create models they just make it easier for you to make them FPSC ready.Nothing you can't do by hand but these apps save you a lot of time and even more aggravation.
You have a few choices here.
As mentioned earlier you can adjust your exporter settings or you can save it and then import it into another app and convert it to .x.
I have had issues with Milkshape exporting .x files.Oh,the static ones are no problem but the animated ones...
Since I use Ultimate Unwrap 3D to UV map and texture my models I just import a model in Milkshape format and then export it in .x.
Ultimate Unwrap 3D is not free but it is very reasonably priced.
Please have mercy and use the search function.