Equivalence of CLM cl_gui_frontend_services=>directory_browse for SAP V.40B

Hi guys.

I hope you can help as well as many opportunities before.

It looks stupid, but we need to make our ABAP programs from 6.0 to an older version like 40B.

And one of the problems is that we have to read the directory in windows in order to download some files.

The problem is that now this method cl_gui_frontend_services=>directory_browse, is not valid in ABAP 40B.

So do you know another alternative to encourage this disadvantage?

Thanks in advance.

R. Romero