The xdf file extension is also used in the OS/2 operating system and used for Extended Disk Format. A .xdf file is created by OS/2 xdfcopy.exe program.
The XDF is also an abbreviation that means Extensible Data Format an XML formatted file used to store high-dimensional data and information developed by NASA. By default, Extensible Data Format uses *.xml file extension.
How to open:
This file type is not meant to be opened directly, there is no software that could open and work with it directly, or there is no information available in public sources about opening this file type. This is usually the case of some internal data files, caches, temporary files etc.
How to convert:
As far as we know, this .xdf file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files.