Why does SNS-HDR strip the EXIF datas ?

I loaded some *.NEF (Nikon RAW) images and got very good results, but unfortunately when I loaded the HDR images in PTGui, to build my 360x180 (spherical) panorama, I noticed that the EXIF datas had been removed, so I had to reset them manually !
Is there a way for SNS-HDR to KEEP the EXIF datas ?
TIA,
J-P.
Is there a way for SNS-HDR to KEEP the EXIF datas ?
TIA,

J-P.