Function XPLMLoadDataFile 

pub unsafe extern "C" fn XPLMLoadDataFile(
    inFileType: XPLMDataFileType,
    inFilePath: *const c_char,
) -> c_int

XPLMLoadDataFile

Loads a data file of a given type. Paths must be relative to the X-System folder. To clear the replay, pass a NULL file name (this is only valid with replay movies, not sit files).