MKVToolNix GUI settings
File type: Settings, options, themes or skins file
Files with the mtxcfg file extension contain settings for the MKVToolNix GUI.
They store application preferences and options rather than Matroska media content.
File type category:
Settings, options, themes or skins file
Date updated: October 6, 2026
The mtxcfg file extension is associated with MKVToolNix, a set of tools for creating and processing Matroska media files. MKVToolNix is developed by Moritz Bunkus and includes a graphical user interface.
The mtxcfg file stores settings used by the MKVToolNix GUI, such as saved application options and preferences. It is a configuration file for the program, not a video or audio file.
MKVToolNix and its GUI are available for Microsoft Windows, Apple macOS and Linux/Unix.
Open the file with the MKVToolNix GUI associated with the MKVToolNix installation on Microsoft Windows, Apple macOS or Linux. The GUI normally reads its settings files itself rather than opening them as media documents.
If the file is not recognized when opened directly, start MKVToolNix GUI and use its settings or preferences functions instead. Do not expect a media player to open this configuration file.
An MTXCFG file is a settings file, so it cannot be meaningfully converted to a media format. MKVToolNix GUI should be used to read or save the settings in the form it supports.
To move the configuration between installations, preserve the file as a settings backup rather than converting it to a media format.
Software apps that manage or store settings in mtxcfg files:
Microsoft Windows
Apple macOS / Mac OS X
Linux/Unix
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