You can transfer files between the two platforms using a CD, a USB drive, or a network connection. You can then transfer the file to your Windows computer and it should open up in the program assigned to that extension. If you have the Mac version of a Windows program (such as Microsoft Office) it will likely save files in a format that can be read by your Windows computer (it will add the correct file extension). Yes, in most cases you should be able to open a file created on a Mac on your Windows computer.