.doc in iCloud through pages?

I've just created a document in Pages and saved it to the icloud.. however it's saved as .pages, i want to be able to login to icloud.com from my PC and download it as a word document?

The problem is college, they use windows, so i need to be able to access my files as word documents, not pages.

When you click to save through icloud it removes the ability to change file extension, and on icloud.com there is a Word and PDF option to download but both are greyed out?

Ideally i want to be able to edit documents on iPad (for when ont he move), Mac (at home), PC (at college)

.. is this possible with iCloud?