wine: Install Mono for Windows to run .NET 2.0 applications

type this in your terminal:

sudo apt-get install mono-vbnc
mono ~/Downloads/ClassRPG.exe

assuming you downloaded the file in your home download directory and it is named ClassRPG.exe

If the application in question is pure .Net and compatable with Mono, simply run:

sudo apt-get install mono-complete

Then run it from mono.

If not, you can use winetricks to install Mono or .Net in order to run it.

For .Net you need to be running a 32bit Wine bottle, but for wine-mono or mono you can run it on 64bit or 32bit