At its core, FolderIco works by manipulating the desktop.ini file. This is a hidden system file in Windows that dictates how a folder behaves. When you change a folder's icon using FolderIco, the tool automatically writes a few lines of code into this file. It tells Windows Explorer to look for the icon at a specific location and use it instead of the default yellow folder. FolderIco automates this technical process, including setting the right permissions and file encodings, so the user doesn't have to worry about any of the underlying complexities.
Look for open-source or free-to-use folder customization tools. Conclusion