In Windows certain words are reserved for system use. When naming files and directories, you are unable to use these words. Con, being short for “console”, is one of these words. Con is also the Spanish word for “with”, so a Spanish speaking user could not, for example, have a directory called “Fotos con Jim”.
I would try out the original before playing 2. DD2 is very similar to the original but DD2 is better in my opinion. If you enjoy the first, you will almost certainly enjoy the second. DD2 may go on sale for Steam’s upcoming Fall sale, something to think about.