Can the Air version of PC75B/PC98B/5075B Plus be used with Windows?

Yes, the Air versions work with Windows. However, they do not include extra WIN keycaps.

The Air models are essentially PC75B, PC98B, and 5075B Plus with Mac mode set as the default. They still support Windows mode, and you can switch modes as needed:

• PC75B & 5075B Plus: Use the switch on the bottom case.
• PC98B Plus: Hold FN + O (Mac) or FN + Q (Win) for 5 seconds to switch modes.