Ok you have PM.

1) if you reduce the size don't will work, you need about 30 POI min.
2) the file .idx and url of folder SPA and ENG, are the same, only have one only difference, the value of START= in the url, it is not very important

I made very much proofs, my mk4 is in english language, i worked in folder ENG and i made files url and idx, for cinemas, casinos, services rolls royce, i made this files building to hand the coordenates and was perfect all ok.

Do you have MK4 sure ?
What model of car do you have?
What version of software do you have installed?
What version of DVD road map do you use ?