Not sure if apps on the Mac side to convert to a Widows platform.... as why would there be for one... This some something that there's be a Widows program for.
Usually u wouldn't be using apps in the source (Mac) side,, u'd find the destination (Windows) platform to find apps for, as that's how its usually done. eg Find Windows programs to convert from Mac (or other formats), not the other way round.
Having said that, you can use "Export" from pages, keynote, and Numbers, but not all at once.. or perhaps you could use Automator.