This function should only be called in a Path Handler script.
Builds a file as the game requests it using callback functions.
UseCallbacks( <length>, <read_callback>, <close_callback>)
- length: The filesize of the file in bytes.
- read_callback: This callback function will get called each time the game tries to read from the file.
- close_callback: This callback gets called when the game is done with the file.
Added this function.