afni.nimh.nih.gov

AFNI can write NIfTI datasets, but the Talairach tranformation
involves writing only the .HEAD file first, which cannot be done
with a .nii dataset.

So convert it to AFNI format for that operation. You can convert
back to NIfTI afterwards:

> 3dcopy s03-2.3danat_flip_brain.nii.gz s03-2.3danat_flip_brain

That will make the .HEAD/.BRIK pair.

On a related note, what is the sform code of that dataset?

> nifti_tool -disp_hdr -field sform_code -infiles s03-2.3danat_flip_brain.nii.gz

- rick