.XTRA file extension is created by Adobe Systems Incorporated. .XTRA has been classified as Plugin, addon Files.
The xtra file suffix is associated with Adobe Director, a multimedia application and authoring platform for Microsoft Windows and macOS (OS X) systems.
The xtra file contains Xtras (plugin) that adds new features to Director for Mac. Xtras files Type "Xtra" Creator "Xown" (MAC).
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 .xtra 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.