>I am 100 % sure my code line work,

I'm sure it works, but not 100% - not if it's in the same directory and your table has a memo field.

Here's the shortest version:

lcDbf=fullpath("{your table with memos here}.dbf")
use (lcDbf)
copy to (forceext(lcdbf, "xyz")) structure extended

Now you try this, and also paste yours.