Plinio,
Check this article in the MSDN:

ODE97: List of Files You Can Redistribute with ODE Run-Time Application (Q163535)

You surely need (some of) the following ones:

GR8409.DLL
GR8GALRY.GRA
GRAPH8.EXE
GRAPH8.OLB
GRAPH8RT.SRG
GRINTL32.DLL
GRINTL32.OLB
MRT7ENU.DLL
MS097RT.DLL
SCP32.DLL

Hope this helps