The Core Media Player skin
File type: Settings, options, themes or skins file
A .csz file is a skin file for The Core Media Player, a multimedia player for Microsoft Windows.
It contains customized interface data that changes the player's appearance.
File type category:
Settings, options, themes or skins file
Date updated: October 7, 2026
The csz file extension is associated with The Core Media Player, a multimedia player developed by CoreCodec for Microsoft Windows. The player supports playback of various audio and video formats.
A .csz file contains skin data for The Core Media Player. It changes the appearance of the player's user interface rather than containing audio or video content, and is intended to be used within that player.
Open a .csz file from within The Core Media Player on Microsoft Windows. The player uses the file as a skin and applies its customized interface appearance.
Other media players are not expected to recognize this skin format.
A .csz file is a software skin rather than a media file, so it normally has no useful conversion to another format.
To create a different appearance, use another skin supported by The Core Media Player instead of converting the file.
Software apps that manage or store settings in csz files:
Microsoft Windows
The Core Media Player
Language
