An ncsa file extension is related to the Hierarchical Data Format (HDF). Probably obsolete format.
NCSA file extension - Hierarchical data
What is ncsa file? How to open ncsa files?
File type specification:
Hierarchical Data Format (HDF) is a data file format designed by the National Center for Supercomputing Applications (NCSA) to assist users in the storage and manipulation of scientific data across diverse operating systems and machines.
This ncsa 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.