Thanks for such an easily-understood-by-beginners explanation! I guess now I finally how pp works. It really took me a long time to go though the links mentioned here and test all the methods but still feel confused.

I wish there are always detailed information that helps beginners like me to be able to follow. For this case, I thought after 'compiling', all I need to deliver is the .exe file. I didn't know that the additional icon folder should be presented too. Information like this can save people a lot of time.

Thanks again!