What is a USF file?
A .USF file can serve several different purposes depending on the software that created it. Most commonly, it functions as a user interface skin file for hardware monitoring and overclocking software, such as MSI Afterburner and RivaTuner. Another popular variation is the EVGA Precision X Skin File used to customize utilities from EVGA. Additionally, game developers use .USF files as shader files within Unreal Engine by Epic Games. Other less common uses include XML-based user search filters for Microsoft Lync Server, Universal Subtitles Format files, and Nintendo 64 Music files.
How to open USF files?
To apply a .USF skin file, you need to copy it into the dedicated skin folder of the corresponding software, such as MSI Afterburner or EVGA Precision X, and select it from the application settings menu. If the file is an Unreal Engine shader file, an XML search filter, or a Universal Subtitles file, it contains plain text data. You can open and read these text-based files using developer tools or basic text editors like Notepad++ or Visual Studio Code.
Best practices and troubleshooting
Because the .USF extension is shared by multiple distinct programs, you might experience errors if you try to open the file in the wrong application. If your software does not recognize the file, do not change the file extension manually. Renaming a file does not convert its internal format. Instead, you should inspect the raw file contents to identify whether it contains text data (like a shader or subtitle) or binary data (like an archived skin package).
Identify and inspect with viewer.online
viewer.online/usf can analyze .USF files to identify the exact format and creator software, inspect the file structure, extract readable text, and check whether an online preview is available. Since .USF has multiple possible meanings, we strongly recommend using viewer.online/usf to identify the actual format of your file. This platform is highly useful for identifying, inspecting, and understanding .USF files without installing software or dealing with compatibility problems.