Your icon must be in .ico format. For macOS, use .icns (or any PNG/JPG will work in a pinch).

Right-click an empty area on your desktop and select . In the Settings window, navigate to Themes . Scroll down and click Desktop icon settings .

To ensure icons appear sharp (especially on high-DPI monitors), it is recommended to use images with a resolution of at least 256x256 pixels. Standard image files ( .jpg , .png ) must be converted to the icon format ( .ico ) using an online converter or image editing software before they can be applied via the "Browse" function.