The xdf file extension is related to the image files from Sharp X68000 computers.
XDF file extension - X68000 image file
What is xdf file? How to open xdf files?
File type specification:
The Sharp X68000, often referred to as the X68k, is a home computer released only in Japan by the Sharp Corporation in 1987 distributed with Human68k operating system.
The xdf file stores image from X68000 Sharp computer.
This xdf 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.