Anyone know owt about PKZIP?

Again back to this legacy FPD26 system I have to maintain, cos I stood on a butterfly in some other life, or something.

It's been working fine and dandy for donkey's years. The system produces a table of data from the bus operator then comprsses it:

   run /0 pkzip &thisziph &thislist -3 -)

Later the user is asked if zip to a floppy or other medium and the data are zipped to the chosen medium, in this case a floppy:
...

   if isfloppy
      run /0 pkzip -& &thiszipf &thislist -3 -)
   else
      run /0 pkzip &thiszipf &thislist -3 -)
   endif

Now this last zip fails with the message:

"XMS version 2 detected Using normal compression DOS verify is off" (or so I'm told by the user).

Can anyone shed some light on what the problem is all of a sudden?

'ppreciate it

Terry