Thanks for your post, (Palemetto , Drew and all). I shall try to work as you suggest.
Well, I have personally found changing the file extension helpful in disguising the files which I do not wish others to explore (for some reasons); and it has seemed to work.
Usually, users experimenting and satisfying their curosity by checking the files on disk are put off by files for which they (users) have no understanding of file handler / file opening programs.
I was not sure of .pif and just tried it on a test file to see the results.
I will check it out today.
;)