The preposition 'on' is correct.
I want to install Photoshop on my computer
We use 'on' for most of communicating devices that connect
on phone, on computer, on fax, on the Internet...
However, for computers, remember one thing.
When it is general and not so specific about the location, we use 'on'. So, it is broadly talking about being held by the computer.
Photoshop is installed on the computer
Drive E is on the computer
But then when you go further, one step further for a specific location, we use 'in' the computer.
I have MJ's collection on my computer in Drive D
The scanned documents are in the My Documents folder
Make your personal folder in Drive E
You may also use 'in' when referring to an item that has some spacial boundaries.
Type something in Microsoft Word
Type something in the text box
Things without specific boundaries
Put this photo on the desktop
As James says in the comment, making folders on some drive is also used but it is a bit more subjective.
Point 1 is correct and is often used in regular conversation.
Point 2 is incorrect and never used in conversation. However what is often said is "just for clarity...", which is correct.
Point 3 is correct and sometimes used in conversation although not as common as point 1, or the phrasing "just for clarity".
Best Answer
The idiomatically correct way to say it is "Congratulations to you too."
English prepositions are very difficult to learn, because there are not a lot of rules and you mostly just have to learn every case separately. In general, if you can imagine yourself "sending" feelings like congratulations or thanks, the appropriate preposition is to.
But we also say
So as you can see a lot of it depends on the exact sentence you use. In the case of "congratulations", it's always to.