A bda file extension is related to the Spectral data file format used by Bragg Crystal Spectrometer.
BDA file extension - Spectral data
What is bda file? How to open bda files?
File type specification:
The bda file extension is used for compressed data files that contain spectrometric data.
The bda files are probably only used in Bragg Crystal Spectrometer (BCS) in specialized Yohkoh software.
This bda 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.