Hi, 

Now I've installed fsl to figure out why I cannot open files with Mricron. I'm using Mac, so in Terminal I receive this info;

"ml-181128-006:~ Xerhad$ fslhd corr_Subject001_Condition001_Source001.nii
Image Exception : #63 :: No image files match: corr_Subject001_Condition001_Source001
No image files match: corr_Subject001_Condition001_Source001
ml-181128-006:~ Xerhad$"

Seems to me the problem isn't about permission, right? Could you help me further? I've never used Terminal before. 

Thanks in advance, 
Hanna