
### Environment

* Dubbo version: dubbo-2.6.4
* Operating System version: windows 10
* Java version: JDK1.8

When run the testcase(com.alibaba.dubbo.config.AbstractInterfaceConfigTest#checkApplication1) in windows environment,It will be wrong. 

So It should add scene judgement in windows environment(org.apache.dubbo.common.utils.ConfigUtils#loadProperties(java.lang.String, boolean, boolean),Line 220).

```java
if (fileName.startsWith("/")) {
````
change to
```java
if (fileName.startsWith("/")||fileName.matches("^[A-z]:\\\\\\S+$")) {
````
the testcase (com.alibaba.dubbo.config.AbstractInterfaceConfigTest#checkApplication1) will go well.





import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class ConfigUtils {
    private static final Logger logger = LoggerFactory.getLogger(ConfigUtils.class);
    private static Pattern VARIABLE_PATTERN = Pattern.compile(
            "\\$\\s*\\{?\\s*([\\._0-9a-zA-Z]+)\\s*\\}?");
    private static volatile Properties PROPERTIES;
    private static int PID = -1;
    private ConfigUtils() {
    }
    public static boolean isNotEmpty(String value) {
        return !isEmpty(value);
    }
    public static boolean isEmpty(String value) {
        return value == null || value.length() == 0
                || "false".equalsIgnoreCase(value)
                || "0".equalsIgnoreCase(value)
                || "null".equalsIgnoreCase(value)
                || "N/A".equalsIgnoreCase(value);
    }
    public static boolean isDefault(String value) {
        return "true".equalsIgnoreCase(value)
                || "default".equalsIgnoreCase(value);
    }
    /**
     * Insert default extension into extension list.
     * <p>