I bought the "Hammers of Fate" expansion, but it only works with DVD-ROM.

so that it would play on a DVD-RW

So, do you have a CD or DVD drive? It's a bit strange how you're writing this. If you have a DVD-RW, it should be able to read regular DVDs... But if you have a CD drive, there are no programs for that, as these are fundamentally different formats. The only thing you can do is ask a friend to bring you a DVD drive and install the game from it.