I agree with Zoredache, it depends a great deal on what you used to write the data.
If you used tar (or amanda, which uses freely available tools), Richie's suggestion of using cygwin may be good, because you may be able to get whatever tool running under it.
I don't think that 'dd' will give you much usable information, since it will essentially create tape images. The exception would be if you were to make images of the tapes and present them to a Linux virtual machine running whatever software you used to create them.
More information will get you a better answer.