VFP provides the filetostr function and can compare exactly 2 files as code below.
its a simple test before going to fine investigations with heavy solutions.if 2 files equals no need to use a third software.

local m.lcfile1,m.lcfile2
m.lcfile1=getfile()
m.lcfile2=getfile()

if empty(m.lcfile1) or empty(m.lcfile2)
return .f.
endi

if filetostr(lcfile1)==filetostr(lcfile2)  &&exact string compare
messagebox(lcfile1+"  equals  to  "+lcfile2++chr(13)+"  length (chars)="+trans(len(filetostr(lcfile1))))
else
messagebox("2 files not equals"+chr(13)+lcfile1 +  " [len (chars)="+trans(len(filetostr(lcfile1)))+"]  "+chr(13)+lcfile2 +" [len (chars)="+trans(len(filetostr(lcfile2))))
endi