private static extern ErrorCode SetFileSystem(IntPtr system, File_OpenDelegate useropen, File_CloseDelegate userclose, File_ReadDelegate userread, File_SeekDelegate userseek, File_AsyncReadDelegate userasyncread, File_AsyncCancelDelegate userasynccancel, int blockalign);
private static extern ErrorCode AttachFileSystem(IntPtr system, File_OpenDelegate useropen, File_CloseDelegate userclose, File_ReadDelegate userread, File_SeekDelegate userseek);