Vector Source file .dat not recognized

Hi,
I have some problem with shape optimization study using hypermesh and abaqus (tutorials HS - 1550). I created some shape's on my model and defined step, next I generated the input file and I done everything like in the tutorial (of course on my model), but when I want to open a .dat file in vector source (in Hyperstudy) I couldn't choose any type and in message log was written that error: File not recognized. I checked the analysis in abaqus  and everything was fine. But I don't know why I can't choose any type in vector source in Hyperstudy.

Please, if anyone was having the same problem, maybe he could help me.