You will also need dosbox to run buildpmt on 64bit OS's.

You don't need to transfter via FTP. If you use a terminal emulator (eg hyper terminal, secure CRT) that support xmodem transfer protocol you can transfer the pmt files via the port activity screen to the vm.

Also you need to save the source file into the following format:

8bit, 8KHz mono ADPCM VOX
then convert it via buildpmt.

Switch by NCH software does this conversion well i found.