Share Specific Files to Network Device But Not to Homegroup?

I have a Homegroup configured on my Windows 7 install and I've got music, movies and images that I share across the different computers in my house and the other user accounts on the PC. I've got MKV files (soccer matches mostly) that I've converted to be played on the PS3 and I'm wondering if there is another way to share them with the PS3 without having to share them with everyone else as well?

I've added them to the "Video" library and then attempted to share them only with my user account but it also stops Windows from sharing them with the PS3. Is there any way for me, when searching for specific people to share with, to choose these other network devices like my 360 and PS3 in the same way that I can choose specific accounts (Mom, Dad, Guest, etc., etc.)?

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