An ndpa file extension is related to the NanoZoomer scanner and used for its annotation files.
NDPA file extension - NanoZoomer annotation data
What is ndpa file? How to open ndpa files?
File type specification:
The ndpa file extension is associated with the NanoZoomer a series of slide scanners developed by Hamamatsu Photonics K.K.
The ndpa file stores digital pathology annotation data used by NanoZoomer.
This ndpa 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.