Hmmmm....

Just for a test.
Since you have Win98 on a PC, try this "old trick" as well:

Put a bit of tape to cover the hole who is not closeable at
a 1.44HD diskette.
Format it as a 720DD in Win98, then copy some files into it
and try load into KN2000.
It might be worth a try, I've seen some problems solved that
way before.
Also 720DD disks are hard to find nowadays.. looks like time
and developements run fast.

Good luck, but don't forget to take a break and have some
nice moments by Happy Playing as well.
GJ