Hello freesurfer experts,

I am editing the registration matrix between two volumes (fsaverage's T1 to fit MNI152 from fsl) using tkregister2, and I cannot save the registration because I do not have permission to change the .dat file I originally opened with tkregister2. I cannot change the permissions. I do not want to lose all the editing I have done so far, so would really appreciate if someone could give me advice on how to save the registration as a seperate file either in GUI or from terminal.

FYI, I know ideally I shouldn't need to edit the registration but for some reason I had weird flipping issues when using mri_vol2vol and mni152.register.dat with --inv option. Also the system for some reason does not recognize a binary volume with the --interp nearest option, so fills in the whole volume. I would appreciate any suggestions.

Best

Idil