you have 2 options, the second one requiring InputAssistant +
a gif image that looks like a normal pushbutton (in PaintShop
you can use the function Special Effects->Buttonize). In the
GuiXT script, display the button with the "Image"
command. Use the Start="..." option to start your PC
program when the user clicks on the image. You can also pass
parameters, e.g. passing a material number with
your GuiXT script, define a new pushbutton with a
process="..." parameter. In your InputScript, use the
View "abc.exe" to start the exe file. Parameter
passing as in option 1.
second option is a little more flexible, since it allows you to
perform other actions in the SAP system before calling the PC
application (e.g. create a local temporary file with same data
or to call RFC functions first to read more data).