private static extern void NFD_PathSet_Free(ref NfdPathset pathSet);
private static extern ulong NFD_PathSet_GetCount(ref NfdPathset pathSet);
private static extern IntPtr NFD_PathSet_GetPath(ref NfdPathset pathSet, ulong index);
private static extern NfdResult NFD_OpenDialogMultiple( IntPtr filterList, IntPtr defaultPath, out NfdPathset outPaths);