How to delete a file on the server during the execution of an application with Forms 11gR2 and a ser

I have a process for generating an excel file in which I initially create a  file.csv on the server side using the text_io package. After that, using WEBUTIL_FILE_TRANSFER.AS_To_Client, I transfer the file to the temporary folder of the client. How I can delete the file.csv from the server after the transfer done? What I have been able to do is open it with TEXT_IO again in 'W' mode and then close it, leaving it content empty. I tried to use the webutil_file.delete_file instruction ('c:\ tmp\file.csv') but try to delete the file on the client side but is not what I