Unable to start the burn due to files

[skit1823]

I downloaded imgburn to help me burn 360 games and expanisons for comp games.. i used another progarm to copy my civ4 expansion.. and it worked fine.. but when i try to burn to imgburn.. its not even finding the files on my comp.. i go back to my computer to my downloads find left 4 dead and all the game files are there.. whats the issue here? or do i need to explain myself better?

[LIGHTNING UK!]

Are you trying to burn an image of a disc or just a random bunch of files?

 

i.e. what are the names of the files you're trying to burn? *.ISO, *.DVD ?