While MIDP provides methods for loading Images, it doesn't include a specific mechanism for loading files of arbitrary types. There's a simple workaround, though, that's based on three straightforward things you can do:
You can package any type of file in the JAR file that makes up your MIDlet suite.
You can open an InputStream to any file in your res directory.
You can read a resource file using the getResourceAsStream() method.
This example reads a text file into a StringBuffer, but you could easily modify it to read other types of files, including those containing binary data.