DBU used and windows DBF needed

I still use the DBU 1986-1990 to create datbases but changing the
fields names cause the memo fields to be lost and all windows DBF
viewers are trial version and not freeware. Even the free when I open
it popup the error : wrong memo format .
I printed the structure of a DBF found version : dBASEIII+with memo

Please help me to get a freeware complete source of good windows DBF
viewer to update the fields without losing or recreate the dbf created
already from DBU.EXE.
Thanks