fix: flexible for non-nii files as well
fix: flexible for non-nii files as well

poldracklab/fmriprep,oesteban/fmriprep,oesteban/preprocessing-workflow,poldracklab/preprocessing-workflow,oesteban/fmriprep,poldracklab/fmriprep,poldracklab/fmriprep,oesteban/fmriprep,oesteban/preprocessing-workflow,poldracklab/preprocessing-workflow