STD.File.SetReadOnly( filename , flag )
| filename | A null-terminated string containing the logical name of the file. | 
| flag | A boolean value indicating which way to set the read-only attribute of the filename. | 
The SetReadOnly function toggles the read-only attribute of the filename. If the flag is TRUE, read-only is set on.
Example:
A := STD.File.SetReadOnly('Fred',TRUE);
 //set read only flag on