First, download dat-maker [Only registered and activated users can see links. Click Here To Register...]
Spoiler for Click for pictures!:
1, load up the model you are going to add priority to.
2, check the priority box at the top.
3, See that gren text? Get the nuber at the end of it and put it in the box shown in the picture.
4, Check the PRI box
5, click "make.dat"
Then it should export the model in .dat form, ready to be gzipped.
