Windows 7: Hi Res Album Art display size

Hi, my first post - and I apologise if this question has been dealt with already.

I am running Windows 7 64bit, and using exclusively for media centre. My music is all in uncompressed WAV format, I have digital out, to Lindy DAC, then through my Cambridge amp. So I have tried to maximise the quality of my music to be the best possible through my equipment. I have then found hi res versions of my album art (this is a work in progress as I have over 700 cds ripped in WAV format) and replaced the default artwork by adding 4 His res files called 'Folder', 'AlbumArt_Large', 'AlbumArt_Small' and an 'AlbumArtSmall'. That all works fine, and windows media centre displays my lovely hi res artwork when playing an album.

Now, I started to wonder if I could increase the size of the album art that media centre displays on screen, but cannot find anywhere to do this. Can anyone help?

Thanks
MrLenny.