I currently have four HTML pages stored locally on my computer. I have tried linking them together using

<input type="button" value="Product Description" onclick="window.location='C:FILEPATH'">

It says Firefox does not recognize (c) as a protocol. I simply need the pages to link together.

Note: This project is for a class (not a computer science class) and therefore it does not have to work on the web, I simply need it to run properly off my computer.