.SKIN File Extension

File used by InstallShield, a program that allows users to create Windows program installers; contains skin data that is used to customize the look and feel of the installer windows; can be generated using a program called InstallShield Skin Customization Kit, which is included with InstallShield products.

The InstallShield Skin Customization Kit program CreateSkinFile.exe may be used to extract SKIN files.

A SKIN file is a character model skin definition file used by games based on the id Tech 3 engine, including Quake III Arena and related titles. Rather than storing image data directly, a SKIN file specifies which texture files and shaders the game should apply to specific parts of a 3D character model. The SKIN file allows the same model to appear in games in different outfits, colors, teams, or visual styles without requiring separate copies.

The format was developed for games created by id Software and was later used by other games built on the id Tech 3 engine. A SKIN file typically contains a list of model surfaces and the texture resources assigned to each one. During gameplay, the engine reads the file and uses its instructions to render the character with the correct appearance. Game developers, mod creators, and players who customize game content commonly work with these files.

SKIN files typically store plain text. The contents consist of mappings between model components and texture or shader paths. Since the file stores references rather than image data, it is typically used alongside model and texture files stored elsewhere in the game's data directories, making it easier to create alternate character appearances while reusing existing game assets.

SKIN files are not meant to be manually opened. Instead, the id Tech 3 engine game it is packaged with references the files when loading characters for gameplay.

However, game modders may open and edit SKIN files with any text editor, such as Microsoft Notepad, Apple TextEdit, or Microsoft Visual Studio Code to view or modify its contents. To see the visual results of changes made to a SKIN file, you generally need to load the associated character model and textures in the game.