>is it possible to monitor the state of tables using native vfp function ?
>has anybody already done it ?

Yes... Once you get them to a backup directory (or you could even check them in the live directory too). You could do the following to make sure the tables at least open natively...

lcBadFiles = ""
on error llBadFile = .t.
lnFiles = adir( laFiles, "SubDirectory\*.dbf" )
for lnI = 1 to lnFiles
   llBadFile = .f.   && always reset flag before testing next file
   use ( "SubDirectory\" + laFiles[ lnI, 1] )
   if llBadFile
       lcBadFiles = lcBadFiles + laFiles[ lnI, 1] + chr(13)+chr(10)
   endif
endfor 

if not empty( lcBadFiles )
  messagebox( "Some Bad Files: " + lcBadFiles )
endif 
on error