How to make a .p file read-only at run time??

Hello All,

I have been able to open a .p file through coding..

RUN adecomm/_pwmain.w
    (INPUT "":U,         /* Parent ID String */
     INPUT fileName,  /* .p File name(s) to open  */
     INPUT "":U).        /* Startup commands */

Now I want to make this <fileName> file as read-only.

How can I do the same??

Waiting for the responses..

Thanks Much,

Payal Arora