Even something like loading a file into a text editor containing the appropriate pattern would be sufficient; but what's more interesting to consider, is what happens if you happen to have that pattern in memory before starting Windows, but it's the incorrect size of SFT for the version of DOS --- I could imagine some pretty odd things happening... as well as KB article getting published if some important customer ran into it:

"Windows becomes unstable when started after you work with files containing 3 or more occurrences of 'CON' spaced between 16 and 256 bytes apart."