An fxi file extension is related to the Casio FX interface format.
There is one other file type using
the FXI file extension!
.fxi - File-Ex data
FXI file extension - Casio FX interface format
What is fxi file? How to open fxi files?
File type specification:
The fxi file extension was also used for Casio FX, a family of programmable calculators from Casio.
The fxi file stores interface data.
Most likely some old format without support. No further information could be found.
This fxi 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.