src/Composer/Downloader/ZipDownloader.php
public function extract($file, $path)
    {
        // Each extract calls its alternative if not available or fails
        if (self::$isWindows) {
            $this->extractWithZipArchive($file, $path, false);
        } else {
            $this->extractWithSystemUnzip($file, $path, false);
        }
    }
public function extract($file, $path)
    {
        // Each extract calls its alternative if not available or fails
        if (self::$isWindows) {
            $this->extractWithZipArchive($file, $path, false);
        } else {
            $this->extractWithSystemUnzip($file, $path, false);
        }
    }
extract $file to $path

@param string $file File to extract
@param string $path Path where to extract file