Hello LouisAbernethy.
Compiling a 16 bit application with a 32 bit or 64 bit compiler is not enough to port your application to a newer operating system: this kind of upgrade will require a rewrite of most of the code, since many old system calls or functions cannot be used anymore
in modern Windows version; this will problably make you waste a lot of time trying to make your software run.
If you really need to use that old software you can rely on virtualization: install a virtualization program, create a virtual machine and install the operating system you need to install and run tha application.
Bye.
Luigi Bruno
I add that you could try running this program by installing a virtualization program like Oracle VirtualBox (http://www.virtualbox.org), create a new virtual machine and install the operating system and the software
you need to use.
Bye.
Luigi Bruno