There are two MTA packages:
MTA_Vxxx.nnn This is the normal package, containing the programs and
all suplemental files (utilities, documentation);
MTA_OVxxx.nnn This is the package that contains MTAOVR.EXE and the
overlay (MTAOVR.OVR). There are no further files inside
this package. It has been separated from the original
release because non-BBS users won't use the overlayed
version (in general) and to keep the package as small
as possible;