I know that you can embed a .jpg file in an mkv. I first heard about it when reading the MakeMKV homepage. I know, in theory, why you would want to do that; so that all your metadata is contained in one neat, clean file. So, I used MKVtoolnix to add a .jpg of the movie poster to an MKV file (as an attachment). But...

What programs/players can see it? My WinXP PC doesn't seem to... I tried XBMC and also saw nothing and, while I did do the reg hack to see/play MKV files in XP MC2005, that did not show the .jpg, either.

Am I missing something? Can no program display the .jpg movie poster attachment in my MKV?