PMFJI-
I *think* that if you insist on hacking the SCX (and lot's of us do that every now and again), then at least try it as a regular file.

For example:

USE myForm.scx && Since an SCX is a DBF with a different extension
MODIFY MEMO PROPERTIES

This is a LOT safer and far easier than using lowlevel file functions.  You can even do a REPLACE FOR combined with a STRTRAN call to change multiple records.  Be forwarned, though, to make a backup of your form, first!