Use G-Archiver? Don’t.
If you have ever used the program G-Archiver, cease. The program sends the usernames and passwords of everyone who uses the program to the program’s author.
This is a flagrant violation of trust, ethics, and the rights of computer users.
This is why I do not trust software that is closed-source by nature, because it is all too easy for abuses like this to be built-in to the software. Fortunately, someone spotted the problem and alerted the world (see the link above), but only after over one thousand five hundred accounts had their login and password information sent to the author of this program.
If you have ever used G-Archiver, change your passwords immediately to something strong. Good examples of strong passwords are things that you will remember, but are hard to guess, consist of upper-case letters, lower-case letters, numbers, and special characters such as the period or the exclamation point, and more than one of each type of thing.
This is why freedom should reign. We become victims all too easily when we shun our freedom. (And this does not just apply to software…)