Okay Folks,
Let's talk Tobit. It's a part of Catholic and Orthodox canon it's been around a long time and for those that are curious as to why it's included in the Old Testament Texts its because it shows fiidelity to the law, the intercessory function of angels, piety towards parents and marriage, reverence for the dead, benefits of alms giving, prayer and fasting. All of which are intrinisically part of Jewish and Catholic\Orthodox worship. Thats why it's included. As for why it's not in all Bibles its simple. When Luther translated the Sacred Scriptures he re organized the Bible moving some books to the back notice he kept them but didn't put a high amount of value on some texts because they didn't make sense to him. The remove came much later after his death by the publishers of the day who probably figured its simply easier and cheaper to remove the books that aren't thought of valuable rather than print them and it saves money too. That's why the Reformation canon has 66 books, the Catholic Canon has 73 books, and the Ethiopian Orthodox has 88 books. The reformation canon is a great canon however, since it doesn't utilize all the books the Catholic canon does it can lead to misunderstandings of why catholic doctrines aren't in the bible when in fact they are. In essence its like having a hand tied behind you back.
Sincerely,
Maronite