11.   Before long they had encoding schemes that could take a program file and convert it into mailable text strings.

12.   Conventional wisdom in the networked world had suggested that one could elude viruses simply by shunning program files of unknown provenance.

13.   It mentioned deleting old program installation files, which I assume are only used once when you install a program.

14.   Most people know better than to run program files they receive as an attachment, so why should a Word document be any different?

15.   On a Mac, find the program file you want to use.

16.   The software evades detection by not popping up in program files or on computer task lists.

17.   These are program files that actually launch and run.

18.   To this end, files and documents ought to be kept in their own directories, and not lumped in with the program files.

19.   Today, most traffic on the Internet is made up of program files, ordinary text and graphics from Web sites.

20.   Toward the end of the day, Holley got down to the level of individual program files.