Hey.
Not sure why Add to Game is not working for me. Bassically it allows me to choose launch application, I launch it with Sims 3 Launcher, but in the launcher as I said, the item appears void (no name, no description, no picture, 1kb).
Now the save file works great. I save it in downloads and then with Sims 3 launcher I can install it (it has description, picture, good size, etc). So thank you very much, not sure why I didn't tried it before.
Also, what exactly do you mean by batch content adder?
In the end cheers. You made an awesome program!