[Freesurfer] Constraining fMRI data with a surface label generates a bfloat file?

Hello Freesurfer Experts,

Using func2roi (in stable3), we constrained our functional data with specific surface labels and t thresholds, and over-threshold masks were outputted as .bfloat files. Does this mean these masks are in volume format and that the volumetric functional data was mapped to the surface but then back to the volume again when the mask was created?

We would now like to project these masks onto the fsaverage brain (for viewing). Can you please let me know how this may be accomplished? It seems mri_convert can not transpose .bfloat to .label, but I imagine there is a way!

Thank you again for the help.

Jacob