DataServices 4.2 : run a script that is stored in a .bat file

Hello,

I use DataServices 4.2

I would like to run a script that is stored in a .bat file

With the following syntax , I get errors : exec (' cmd ', ' path where the .bat file is stored ');
other syntax tested : exec (' path where the .bat file is stored ', '' , 0);

What is the exact syntax ?

Thanks for your help