HT.exe is a GUI application but it can be passed arguments either through a Windows shortcut or via the command line.
HT usage:
HT [-m mode]
The mode value specifies which display mode to start HT in. The default is 0 which his 8-bit color, low resolution if htdata816.pdb is present. Mode 1 is 8-bit color, high resolution if htdata824.pdb is present.