file_var_read doesnt function?

var_nsave filehandle;
var zeitspeicher;

action test
{
player = me;

filehandle = file_open_write("myfile.txt");
file_var_write(filehandle,123);
file_close(filehandle);
filehandle = file_open_read("myfile.txt");
zeitspeicher = file_var_read(filehandle);
zeitspeicher = file_var_read(filehandle);
file_close(filehandle);

}

panel testnew
{
pos_x = 30;
pos_y = 30;
flags=refresh,visible,overlay,d3d;
digits(0,20,5,*,1,zeitspeicher);
}

function main()
{
level_load("testest.wmb");
}