A thing for computer experts?

When , ya know....i had nothing to do.....i opened up Add or Remove Prorams in my PC. While i was looking at my files, i saw a file called "bonjour". I remember i didnt install a file called bonjour ya know.....i suspect its something thats illegally downloaded into my PC(virus maybe?) but i didnt uninstall it, fearing its my computer's important file or something.....