What are the differences between using php_fileinfo.dll and php_fileinfo.so for mime_content_type() in PHP on Windows and Linux?

When using the `mime_content_type()` function in PHP on Windows, you need to use the `php_fileinfo.dll` extension, while on Linux, you need to use the `php_fileinfo.so` extension. This is because the fileinfo extension is built into PHP on Linux but needs to be enabled separately on Windows.

// Check if the fileinfo extension is loaded
if (!extension_loaded('fileinfo')) {
    if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {
        // Windows
        dl('php_fileinfo.dll');
    } else {
        // Linux
        dl('php_fileinfo.so');
    }
}