what is wallet in rippex destop wallet

[Tanushree]

When I download rippex destop wallet, there is file "wallet" which is also downloaded and I have saved it in desktop of my laptop. When I clock the file it does not open and is asking for the type of software in which I should open it like internet explorer, word, etc., how do I open it and what is its relevance? who do I use it ? and is it a necessary file? as without it also I am able to access and use my rippex desktop wallet. Please help as I am new to cryto currency