QuickBASIC is about to save a file and finds one or more
include files that have been loaded into memory but not
saved to disk since they were modified. Either
  - Choose <Yes> to save the modified include files and
    then save the program file.
  - Choose <No> to save the program file, but not the
    modified include files, if you are still experimenting
    with the include file or do not have complete
    confidence in it.
  - Choose <Cancel> if you don't want to save any files.