NII file extension - NIfTI-1 Data Format
What is nii file? How to open nii files?
File type specification:
The nii file extension is used for the NIfTI-1 Data Format, which is used for the neuroimaging purposes.
The NIfTI-1 is adapted from the widely used ANALYZE 7.5 data file format.
This nii file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.