Hard Disk Storage

Is there a way of checking remote PCs to see how much of the hard drive is taken up with MS Office documents?

I would like to run a report that tells me how much space on all our user's laptops is taken up with MS Office files (Excel, Powerpoint, Word). Currently a lot of our laptop users are saving their data to the local HDD and we would like to get them to back up this data to the network. It would be...