🚀 Contribute! Buy me a coffee

X4K File Extension

The X4K file extension was created by Optimal Performance and is also known as the XML4King Configuration File. X4K is classified as a Settings Files and You can open and render the contents of this file in a Text Editor. You can open X4K files in C64 online emulator program.

XML4King Configuration File Type

XML4King Configuration File Type
Extension .x4k
Developer Optimal Performance
Popularity 5.0 (1 Votes)
Mime Type mime-type/not.available
Default Program C64 online emulator
Category Settings Files
Format Text
Updated 7/1/2025

What is a X4K File Type?

All X4K files are saved in text format.

Free Online X4K Tools & Apps

Access powerful and secure free online X4K tools to convert, view, edit, merge, split, and compare X4K files — all without installing any software. Our tools support the .X4K (XML4King Configuration File) file extension and run smoothly in any modern browser.

Select a tool below to explore features and manage your X4K files directly from your device with ease.

X4K Files Common Issues

There are few common issues with the XML4King Configuration File .X4K File Extensions while opening the .X4K files on Windows and MacOs, we have solution to those issues such as:

Can't Open X4K Files?

  1. You must have supported software programs installed for XML4King Configuration File on your system such as C64 online emulator.
  2. Associate default C64 Online Emulator C64 online emulator program for *.x4k (XML4King Configuration File) files.

    Associate X4K Default Program on Windows
    1. Right-click a *.X4K (e.g example.x4k) file and click Open With.
    2. In the Open with dialog box, click C64 Online Emulator C64 online emulator program Or click Browse to locate the program (*.exe) that you want.
    3. Select check box for Always use this app to open .x4k files.

Related X4K File Extensions

X4K default file extension is .X4K and other similer related extensions are:

All Platform Software Programs for X4K File Extension

List of all softwares that can open the X4K files on each platforms such as Windows, Mac, iOS, Linux, Web and Android, you may click the each software link for more details for other supported formats for each software and the verified direct download links for each software with complete lisensing details.

Microsoft Windows logo image Open X4K File on Windows

Software License Developer
WinVICE image. WinVICE 000 for Windows Free WinVICE

MacOs logo image - FileProInfo.comOpen X4K File on Mac OS

Software License Developer

Linux logo image - FileProInfo.comOpen X4K file on Linux

Software License Developer

Website logo image - FileProInfo.comOpen X4K file on Web

Software License Developer
C64 online emulator image. C64 online emulator 000 for Web Free C64 online emulator

iOS logo image - FileProInfo.comOpen X4K file on iOS

Software License Developer

Android logo image - FileProInfo.comOpen X4K file on Android

Software License Developer

About Licensing

  1. Free Trial This software are often used for an attempt period, like 14 days, before requiring payment. Some trial versions have a reduced feature set.
  2. Free This software is liberal to use. Examples include open-source , freeware software, like free programs supported by advertising.
  3. Free+ This software is liberal to download and use, but contains in-app purchases (IAP) to unlock additional content or functionality.
  4. Paid This software must be purchased so as to use it. it's going to be offered as a perpetual license or ongoing subscription.
  5. Included with OS This software is bundled with an OS , like Windows, macOS, or Android.

X4K file extension icon image.About X4K - XML4King Configuration File

FileProInfo is to help you understand about the XML4King Configuration File with *.X4K suffix, and provide the complete detail as how to open, edit, convert, merge, split and compare it with other related software programs, software download links and free online apps and tools.

Our professional team members at FileProInfo have been individually researched and verified the details for X4K. We want to be 100% accurate and publish the information about file formats, tools, apps and software programs that we have tested and validated.

If you would like to suggest any additions or updates to this page for X4K, please let us know.

Updated 7/1/2025