ExtendedService (Java SE 10 & JDK 10 )

```
public interface ExtendedService
```
ExtendedService provides additional support to the current JNLP API, to allow applications to open a specific file or files in the client's file system.

Since:

1.5

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`FileContents`	`openFile(File file)`	Allows the application to open the specified file, even if the application is running in the untrusted execution environment.
`FileContents[]`	`openFiles(File[] files)`	Allows the application to open the specified files, even if the application is running in the untrusted execution environment.

- Method Detail
  - openFile
```
FileContents openFile(File file)
               throws IOException
```
    Allows the application to open the specified file, even if the application is running in the untrusted execution environment. If the application would not otherwise have permission to access the file, the JNLP CLient should warn user of the potential security risk. The contents of the file is returned as a FileContents object.
    
    Parameters:
    
    file - the file object
    
    Returns:
    
    A FileContents object with information about the opened file
    
    Throws:
    
    IOException - - if there is any I/O error
  - openFiles
```
FileContents[] openFiles(File[] files)
                  throws IOException
```
    Allows the application to open the specified files, even if the application is running in the untrusted execution environment. If the application would not otherwise have permission to access the files, the JNLP CLient should warn user of the potential security risk. The contents of each file is returned as a FileContents object in the FileContents array.
    
    Parameters:
    
    files - the array of files
    
    Returns:
    
    A FileContents[] object with information about each opened file
    
    Throws:
    
    IOException - - if there is any I/O error