When "hacking", I strongly recommend qualifying any REPLACE statements with either 'FOR' on the statement or embed between 'IF/ENDIF'. Current documentation of FRX / FRT files may be found by:

cd 'c:\Program files\Microsoft Visual Studio\vfp98\filespec'
report form 60frx1 to print noconsole
report form 60frx2 to print noconsole

You'll want to restrict blanking TAG1, TAG2, Expr for printer controls to Objtype=1, for example, or replacing a graphical file location in Picture for Objtype=17. Hope this helps.