Here is the code with a little error or success checking. Should work fine for KiXtart 3.63

break on
$FileCheck='C:\TEMP\TEST.TXT'
if exist ($FileCheck)
  ? 'Found file : '
  $SetAttrib=setfileattr($FileCheck,128)
  ? 'Setting file attrib was: '+@error+'  '+@serror
  del $FileCheck
  ? 'File deletion success was: '+@error+'  '+@serror
else
  ? 'Unable to locate file '+$FileCheck
endif