Hi...I just had a really quick question...I dont really use excel much so im not sure how to do it

I need to add a sequence of pictures in excel (ex. picture1.jpg through picture 200.jpg)...Excel obviously lets me do picture1 -> picture 200 automatically, but how do I get the .jpg after it too? so far Ive just been manually adding them in, but it would save me tons of time if I knew how to get it to count up with .jpg after it

thanks