RT
M 
Page fourteen states that during the install process, you have the option of choosing between the mouse, keyboard or joystick. The suggested device, according to the manual and default choice for game setup (also suggested by the Abandonia review) is the mouse. This is probably the default.
Try running INSTALL.EXE first instead of launching the application. This should allow you to choose the keyboard.
I would also suggest downloading the Manual since it contains information regarding the default keyboard control functions and how to redefine them, if you so choose.
Ohne