Instead of running a VM, do this once:
- open Takeda Toshiya's page (http://takeda-toshiya.my.coocan.jp/msdos/index.html)
- download "Binaries and Source Codes"
- extract msdos.zip\msdos\binary\i486_x64\msdos.exe to \Masm32\bin\msdos.exe
Afterwards:
- in RichMasm, go to menu File/New Masm source
- in the middle of the greenish box, to the right, there is a string (no, it's not 16-bit COM)
- click on the left one if you want a template for 16-bit DOS code (the right one is 16-bit COM, .model tiny - just for fun)
- hit F6