Host() in XP

The form ran in win98 smoothly,
recently the pc was upgraded to XP pro and the form is not workable anymore.
Here is the problem that i find

v_dir_cmd := 'dir '||p_abc_path||' /b/a-d/o-d > '||p_tmp_path||'abacus.lst';
HOST(v_dir_cmd,NO_SCREEN);

Originally, the directory list will be exported to a file called abacus.lst
But now, the abacus.lst is empty

I tried to delete the file and the form generate an new and empty file

I tried to append the file and it appends nothing

(The command can be run in the XP's cmd.exe)

Can you help me to solve? Thx!

P.S. Oracle 8.0.5, Developer 2000