put it in PMT.ini
[packet]
Encode = packetx64.exe a -v -r -mx -b512 -h4 packedfile.pct datafile
Decode = packetx64.exe x -v datafile packedfile.pct
Infile = datafile
Outfile = packedfile.pct
in arc.ini
[External compressor
acket]
header = 0
packcmd = PMT.exe e {compressor} -b32m -t75p - - <stdin> <stdout>
unpackcmd = PMT.exe d {compressor} -t75p - - <stdin> <stdout>