There are 8 other file types using
the X file extension!

empty icon.x - Alysis SuperDisk self-extracting archive

empty icon.x - Lex language source code

empty icon.x - Microsoft Direct-X SDK 3D graphics

x icon.x - Stardent AVS X bitmap image file

empty icon.x - Chemical modeller output file

empty icon.x - XBLite program file

x icon.x - X11 server import image

empty icon.x - Human68k operating system executable file

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X file - Xview object

What is x file? How to open x files?

File type specification:

Various data file type icon Various data file type

The x file extension is associated with XView, a widget toolkit from Sun Microsystems introduced in 1988. It provides an OPEN LOOK user interface for X Window System applications, with an object-oriented application programming interface (API) for the C programming language.

Its interface, controls, and layouts are very close to that of the earlier SunView window system, making it easy to convert existing applications from SunView to X. Sun also produced the User Interface Toolkit (UIT), a C++ API to XView.

The XView source code has been freely available since the early 1990s, making it the "first open-source professional-quality X Window System toolkit".XView was later abandoned by Sun in favor of Motif (the basis of CDE), and more recently GTK+ (the basis of GNOME).

XView was reputedly the first system to use right-button context menus, which are now ubiquitous among computer user interfaces. However, the claim to that first may in fact lie with Acorn Computers' Arthur operating system, which was released in 1987, though it used the middle mouse button rather than the right.

The .x files contain object data used by XView.

This x 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.

The default software associated to x file type:

SunOS icon

Sun Microsystems, Inc. logoSunOS  Linux/Unix software

Company or developer:
Sun Microsystems, Inc.

SunOS is Unix operating system for workstations and servers. SunOS is based on BSD Unix. From SunOS version 5 is based on Unix System V and called Solaris.

Help 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 .x 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.

List of recommended software applications associated to the .x file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open x file, edit x file, convert x file, view x file, play x file etc. (if exist software for corresponding action in's database).

  • Others x file

Unspecified and all other actions for computer programs working with x file - Xview object

Click on the software link for more information about SunOS. SunOS uses x file type for its internal purposes and/or also by different way than common edit or open file actions (eg. to install/execute/support an application itself, to store application or user data, configure program etc.).


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