Files with nii file extension are associated with the NIfTI-1 Data Format used for neuroimaging purposes.

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NII file extension - NIfTI-1 Data Format

What is nii file? How to open nii files?

File type specification:

Various data file type icon Various data file type

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.

Help how to open NII files:

This file type is not meant to be opened directly, there is no software that could open and work with it directly, or there is no information available in public sources about opening this file type. This is usually the case of some internal data files, caches, temporary files etc.

How to convert file with extension NII:

As far as we know, this .nii file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files.

Related links:

NIfTI-1 Data Format

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